Pacom PC868 Infrared thermometer User Manual

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Pacom PC868 Infrared thermometer User Manual | Manualzz

PACOM

Infrared thermometer

PC868

User's Manual

The ear and forehead temperature measurement function had reviewed and approved by Notified Body SGS!

Please read this manual before use!

1. Summary of Infrared Thermometer

Thank you for choosing our Infrared Thermometer. The PC868 Infrared Thermometer is used to measure an objects temperature based on the relationship between temperature and measurable infrared radiation. Simply aim the unit’s probe toward the surface to be measured to obtain a quick and accurate temperature.

To ensure proper use, please be sure to read this user manual carefully, paying close attention to the safety precautions.

In order to use this product correctly, please read the user manual before use.

In order to properly use this product, please carefully read the full text of this manual before using, in particular the “safety precautions” section.

 Please keep the instructions on the side for easy checking.

Basic principles:

All objects above absolute zero temperature emits certain percentage of infrared radiation energy based on its temperature. The amount of the radiation energy and the distribution of the wavelength have very closely relationship. When human forehead’s temperature in 36-

37℃, it emits wavelength 9-13um of infrared radiation. Based on this principle, according to the relationship between surface forehead temperature and human forehead’s temperature, we are able to measure the human forehead’s actual temperature through measuring surface forehead temperature.

2. Safety precautions

Warning

Use of this thermometer is not intended as a substitute for consultation with your physician. It is dangerous for user to perform a self-evaluation and self-treatment based on the measuring result. Be sure to follow doctor’s instruction.

Keep the thermometer out of reach of children. For accidental swallow of battery or other component, please consult the doctor at once.

Don’t throw the battery into fire.

Notice

The device is precision instrument, don’t drop, tramp or impose any vibration or impact on the thermometer.

Do not touch the lens of the probe with your fingers, and do not dissemble the device by yourself.

Before measuring forehead temperature, make sure the hair re-moved, sweat dried.

After you do some exercise, eating and bathing, you should stay still indoor about 30 minutes before measurement.

To make the measurement data reliable and stable, when ambient temperature varies a lot, the thermometer should be placed indoors for about 30 minutes before using.

 When we measure somebody continuously, the temperature should be measured every minute, if you need to measure yourself Continuously for a short time, there are some slight errors when you read the temperature ,which is a normal phenomenon. At this time, we should choose the average. We recommend

that you measure yourself continuously maximum of three in a unit of time, and because the temperature of the human will conduct to the thermometer, it may affect the accuracy of measurement.

 There is no absolute standard about the temperature of the human, so please try to collect the recording of

Individual temperature in the usual, as a reference for having a fever or not.

 Do not measure the sites of scarred tissue or tissue compromised by skin disorders, because sensing body temperature from sites of scarred tissue or tissue compromised by skin disorders.

Do not measure the site of forehead temperature if that patients has trauma on forehead.

 Do not measure if that patient is treated with certain drug therapies.

 Do not immerse the device into water or any other liquid, and not directly sunlight exposure.

 Do not use a mobile or mobile or cordless hone near the thermometer when measuring.

 Body temperature may increase in the drug within the effort time limit. Please don’t measure.

In order to ensure the accuracy of measurement data, please don’t take measurement of body temperature in strong electromagnetic interference environment (such as microwave, high frequency equipment operation environment).

 Do not disassemble, repair, or modify the unit.

 This thermometer only a personal device, please do not user with others.

Not touch the battery output when measuring.

 The thermometer must be stored according to the technical specifications.

 The materials (ABS) of expect contact with patient had passed the ISO 10993-5 and ISO

10993-10 standard test, no toxicity, allergy and irritation reaction. The are compliance with the MDD requirements.

Based on the current science and technology, other potential allergic reactions are unknown.

 The patent is an intended operator. The patient can measure, read data and replace battery under normal circumstances and maintain the device and its accessories according to the user manual.

 The device is not intended for PATIENT transport outside a healthcare facility.

Recommendations

1) Don’t use this thermometer for other purposes.

2) It is forbidden to leave the product exposed to any chemical solvent, direct sunshine or high temperature.

3) Don’t expose the thermometer under direct sunlight long time so as not to damaged the battery.

4) Do not measure while talking on the phone.

5) Please report to MANUFACTURER if any unexpected operation or events occur.

3. Intended use

This thermometer is intended with non-contact to measurement forehead temperature at home or hospital, including anyone, such as infants, children and adults.

For the safety reason, children or the baby’s temperature must be measured by parent or adults.

4. Temperature measurement mode and range description

The infrared thermometer has the following measurement mode:

1) Forehead temperature measurement mode -- measure the skin surface of human forehead’s temperature accurately, take the place of traditional mercury thermometer and electrical thermometer.

2) Object temperature measurement mode – you can measure the surface temperature of object, such as ambient, bathwater and milk temperature etc.

Normal temperature range for different measuring position

Measuring position

Anus

Oral

Armpit

Forehead

Normal temperature

(℃)

36.6-38.0

35.5-37.5

34.7-37.3

35.8-38.0

Normal temperature

(℉)

97.9-100.4

95.9-99.5

94.5-99.1

96.4-100.4

Normal forehead temperature range for different ages

Ages

0-2 years old

3-10 years old

11-65 years old

> 65 years old

Normal temperature

(℃)

36.4-38.0

36.1-37.8

35.9-37.6

35.8-37.5

Normal temperature

(℉)

97.5-100.4

97.0-100.0

96.6-99.7

96.4-99.5

NOTE: The normal temperature and difference between the different body parts is individual.

The define yours, measure your temperature for a least 2 weeks at the same ear canal, forehead position and time.

NOTE: When consulting your physician, communicate that the infrared thermometer PC868 temperature is a temperature measured which position, note the individual’s normal infrared thermometer PC868 temperature range as additional reference.

NOTE: Because the forehead temperature is affected obviously by the external environment

(eg: environment, air convection and skin tone, etc),we advice that you take the forehead temperature only as reference.

5. Feature

● Precise non-contact measurements

● User selectable ℃ or ℉

● Set alarm temperature value

● Automatic data hold and auto power save

● Automatic selection range and display resolution 0.1

℃ (0.1

℉ )

● 3 colors backlight

● 2 measurement mode: Forehead and surface mode

6. Overall description

【 Main component including 】

【 LCD display description 】

7. Operation Instruction

【 Preparation 】

1) Check battery

Replace the batteries to ensure power supply if there is low voltage icon for the thermometer.

2) Check sensor

If have pollution and spray, please clean it. (The cleaning method see the chapter 8 Care and Cleaning for detailed.)

If the sensor’s lens is damaged, please stop using.

3) Check thermometer

When you press the [Power/Scan] button, the system will have self testing of software and hardware. If there are problems, LCD will display "Err" symbol. Check if the sensor laser is dirty, damaged phenomenon.

4) In order to make the accurate measuring result, put the thermometer in the measurement environment for 30 minutes.

5) Accuracy of unexpected fluctuations in ambient temperature may decrease the measurement results. When the thermometer at the same measurement position display at different ambient temperature, or test temperature in front of the air conditioner, it will not be able to obtain accurate results.

6) If you want measure forehead temperature, clean forehead and arrange hair, make sure the forehead is naked and clean, in order to ensure the accuracy of measurement.

【 Instruction for use 】

1) Advice for the first use

For stable and reliable results, it is essential to check the infrared thermometer and changes as needed, as follows:

1 st step:

2 nd step:

Take the temperature of a person using a conventional thermometer, you will get

37.5

℃ (99.5

℉ ) for instance.

Take the temperature of the same person using the device keeping the 3 to 5cm distance between the thermometer and forehead (take care to remove any obstacle which could alter the measurement (hair, perspiration ….). If you get 37.5

℃ (99.5

℉ ), the device is

3 rd step:

2 ) Use

1. Install batteries properly set and ready for use.

If you get a lower temperature such as 36.4

℃ (97.5

℉ ), your difference is 1.1

℃ (2.2

℉ ).

You should adjust the temperature on the device and add the difference, i.e.1.1

℃ (2.2

℉ ).

To do it, press the MODE button for 2 seconds, the screen displays F1, press MODE button again until you get F3, press UP button in order to add the difference (in our example 1.1

℃ (2.2

℉ ).

To check, take the temperature again using the product.

2. For the first use or when inserting new batteries, please wait about 10 minutes for the warm-up of the apparatus.

3. If the device is not used for a long time, once you turn it on again, the device will test the room temperature first and will delay turning on for one or two seconds.

4. Select body mode, aim towards the forehead, form distance of 5cm(2in), press the measuring key, the temperature is displayed immediately, accompanied by a beep sound. Making sure there is no hair, perspiration, cosmetic or cap covered on the forehead.

5. If the measurement temperature is 38.0

℃ or more (can be setting, refer to sub-

TEMPERATURE TAKING HINTS

Before take the temperature, please fix the forehead hair to prevent measured deviation.

The sweat on head or cosmetic can affect the accuracy of measurement, please maintain the cleanness of the forehead when measuring.

It is normal that there may be temperature difference depending on various skin types and color, since different skin type will reflect different voltage of infrared ray.

Don’t use the thermometer outdoors.

6.

Select object mode for measuring room temperature, surface temperature etc.

TEMPERATURE TAKING HINTS

For heat-insulated object, please don’t measure the surface.

For the hot liquid, please do not directly measure the surface, because the hot steam fog can condense in the sensor lens and cause the measurement deviation.

3 ) Setting operation

1

2

3

4

5

Mode code

F1

F2

F3

Function Operation step

Set ℃/℉ scale Press MODE button for 2 seconds, the screen will display F1 on the bottom right, press UP or DOWN button can change temperature unit for ℃or℉ .

Set alarm temp.

Press MODE button for 2 seconds, the screen display F1, press MODE button to get F2, select UP to increase the threshold by 0.1

℃(0.1℉), DOWN to reduce it by 0.1

℃(0.1℉). The alarm threshold default value is 38.0

℃(100.4℉).

Set difference Press MODE button for 2 seconds, the screen display F1, press two times to get

F3, select UP to increase the difference by 0.1

℃(0.1℉), DOWN to reduce it by

0.1

℃(0.1℉). In the case of seasonal or environmental changes a verification and adjustment should be carried out.

Note: This function is only effective body.

F4 Set buzzer on/off Press MODE button for 2 seconds, the screen display F1, press 3 times to get

Measurement mode

F4. Select UP to turn on the buzzer, press DOWN to stop it.

There are 2 measurement modes for this device. That is forehead, surface. It is able to take the body temperature of human beings, take the temperature of an area or an object, a food, a liquid or a room.

Forehead Put the mode selection button

6

7

3 colors backlight

Data memory mode on the left, measurement range 32.0 to 43.0

℃(86.0 to

109.4℉).

Surface mode

Put the mode selection button on the right, measurement range 0 to 100 ℃(32.0 to

212.0℉).

In body mode, the device is able to judge whether a fever or not by different color of backlight:

32.0 to 37.4

℃(86.0 to 99.3℉) – Green

37.5 to 37.9

℃(99.5 to 100.2℉) – Orange

38.0 to 43.0

℃(100.4 to 109.4℉) – Red

In surface mode, the backlight always keeps green.

Date memory automatically after temperature measurements, which will display at the right corner of LCD. Press

UP or DOWN button to display the last temperature measurement.

-- Range of alarm temperature

When into the “F-2” mode, the range of settable alarm temperature is from 37.6℃(99.7℉) to 43.0℃(109.4℉).

-- Range of temperature difference

When into the “F-3” mode, the range of settable temperature difference is from 5℃(9℉) to

-5℃(-9℉).

Note: F-3 only for professional doctor and nurse use!

3 ) Temperature measuring

--Taking Temperature in Forehead Temperature Mode (Adjusted Mode)

1. Setup the measurement mode to “Body mode” (the setup step see the above “2)

Function Setup mode”;

2. Make sure the distance between thermometer and forehead is 3-5cm, and press the button of [Power/Scan] directly to measure the forehead temperature .

3. When you hear one beep sound, the LCD will show the result.

TEMPERATURE TAKING HINTS

Before take the temperature, please fix the forehead hair to prevent measured deviation.

The sweat on head or cosmetic can affect the accuracy of measurement, please maintain the cleanness of the forehead when measuring.

It is normal that there may be temperature difference depending on various skin types and color, since different skin type will reflect different voltage of infrared ray.

Don’t use the thermometer outdoors.

NOTE:

1. When measuring, if the environment exceed the 10-40℃ range will be showing Err;

2. If the measured temperature result is < 32.0℃, the LCD will be showing Lo;

3. If the measured temperature result is >43.0℃, the LCD will be showing Hi;

4. If the measured temperature result is ≥38.0℃, the buzzer will be send out “Beep—Beep—

Beep”, a long one and two short ones.

5. We recommend measurement for 3 times to reference, and keep the interval between the two measurements by 5 minutes at least.

--Taking Temperature in Surface Temperature Mode (Direct Mode)

1. Setup the measurement mode to “Surface mode” (the setup step see the above “2)

Function Setup mode”;

2.

Aim the probe tip at the object which will be measured.

3.

Press [Power/Scan] button, then the measurement completed. It will show the measurement data after a “bi” sound.

4.

If the measured temperature is higher than 100℃ , display “Hi”. If the measured temperature is below 0℃,display “Lo”.

TEMPERATURE TAKING HINTS

- For heat-insulated object, please don’t measure the surface.

- For the hot liquid, please do not directly measure the surface , because the hot steam fog can condense in the sensor lens and cause the measurement deviation.

4 ) Automatic shutdown

If you do nothing after the temperature measurement completed and 15 seconds later, the thermometer will automatically shutdown.

5) Memory function

In the power-on state, press the Up/Down button into memory query mode, the LCD will be showing the recorded values or “ ----“ symbol if not record accompanied with memory M symbol. The PC868 can restore up to 99 sets data. the query interface can display memory serial number, body mode and recorded temperature values.

Remark: The temperature result of surface mode can not be saved. And the abnormal body temperature result can not be saved too (such as Lo, Err or Hi).

6) Backlight function

The backlight will be according to the different measuring temperature to lighting different color. The detailed as below table:

Measuring temperature

< 37.5

37.5 to 37.9

Backlight

Green backlight

Orange backlight

Lighting time

7s

7s

≥38.0℃ Red backlight 7s

Remarks: This specification of this table only for the factory default state. If the user into the setup mode to setting the orange or red backing temperature, then will compliance with the setting result.

7) Restore the factory default function

Press the [Setup] button for 5s to restore the factory default status.

The factory default setup is “ ℃ ” and “Body measurement” mode.

8) Battery installment and replacement

1. When the quantity of electric charge is not sufficient, the icon of low battery will appear on the lower part of the screen. Though the battery still can be used, it would be perfect to replace it.

2. When the quantity of electric charge of the battery is lower than the minimal value,

“Lo” symbols will be displayed on the screen, and battery icon flashes and the sound of “Beep” is sent out. Unless you change a new battery, you can not use the thermometer to conduct measurement.

3. Operation of changing battery.

4. Take out the old battery: Open the battery cap; put 2 new AAA batteries on with correct cathode direction into the battery seat.

Notice:

• Please observe the related national laws of disposing the abandoned battery and don’t litter to the garbage can.

• Please take out the battery if the device is not used for long periods of time.

• Please don’t put the battery in the fire.

To protect the environment, dispose of empty battery at your retail store or at appropriate collection sites according to national or local regulations.

8. Care and cleaning

Probe tip (lens) is a most precise part in the thermometer. Please keep clean and entirety in order to assure the accuracy of figure.

The probe tip and lens are the most delicate part of the thermometer. It has to be clean and intact to ensure accurate readings.

If the thermometer is ever accidentally used clean the probe and lens as follows:

Very gently wipe the surface with a cotton swab or soft cloth moistened with alcohol. After the alcohol has completely dried out.

If the lens is damaged, contact the distributor.

Clean the unit body:

Use a soft, dry cloth to clean the thermometer display and unit body.

If very dirty, use a soft with alcohol to cleaning.

NOTES:

Don not use abrasive cleaners.

Don’t use other non-recommended methods to perform disinfect.

Non-waterproof, don’t use the abrasive cleaner to clean the product, don’t drop the thermometer in the water or the other liquid.

9. Maintenance

1) We do not authorize any institution or individual to maintain and repair of the product. If you suspect

that the products have any questions, please contact the manufacturer or distributor to handle the case.

2) The user must not attempt any repairs to the device or any of its accessories. Please contact the retailer for repair.

3) Opening of the equipment by unauthorized agencies is not allowed and will terminate any claim to warranty.

WARNING : No modification of this equipment is allowed!

10.

Calibration

The thermometer is initially calibrated at the time of manufacture. If this thermometer is used according to the use instruction, periodic re-adjustment is not required. If any time your question the accuracy of measurement, please contact distributor or manufacturer, the contact information see last page.

11.

Storage

1) Don’t put the thermometer under the sunshine, high temperature and moist environment or someplace which maybe get in touch with fire or is vulnerable to vibration.

2) Take out the battery if don’t use the device in a long time.

12.

Accessories

Only use original accessories. Check that the contents of the delivery are complete.

Quantity

1pc

2pcs

1pc

Parts

PC868 device

AAA battery

User Manual

13.

Trouble-shooting

Troubles or error message

No response/

Automatically reset

Checklists or situation

The batteries are used up?

Battery in wrong polarity or type?

Poor battery contact

Countermeasures or solution

Replace new batteries.

Take out the batteries and replace new ones.

Take out batteries and reinsert it correct.

The thermometer show the symbol

“Hi”

Temperature hampered by an air flux.

In the forehead measurement mode:

--Temperature readings too close together.

-- Measured the other object, such as the sunlight, the air

Please leave the status and wait for 30 minutes to measure.

Re-measure according to the manual.

The thermometer show the symbol

“Lo” from the fireplace.

Hi: Higher than 43.0℃;

In the object measurement mode:

--Temperature readings too close together.

-- The object temperature is higher than 100℃.

Hi: Higher than 100.0℃;

The hair and sweat prevent the temperature achievement.

Temperature hampered by an air flux.

In the forehead measurement mode:

-- The measuring distance is too far.

-- Measured the other object, such as the air from the air conditioner.

Lo: Less than 32.0℃

In the object measurement mode:

-- The measuring distance is too far.

-- Have water vapor condenses on the lens.

Lo: Less than 0℃

The ambient temperature is beyond of range of measurement (10℃-40℃)

The sensor or hardware is damaged

Low batter, but you can still use it

Keep the thermometer in the room

Whose Temperature is (10℃-

40℃) for 30 minutes

Excluding the possibility of temperature allowance first ,then send the device to your dealer for repair

Keep an eye on power and continue to use.

Lower battery, however you can’t use it

Replace the new battery.

14.

Specifications

Device name

Model

Measurement mode

Power supply

Measuring range:

Measuring accuracy:

(At laboratory conditions)

Clinical repeatability:

Resolution of display

Operation condition

Storage condition

Size

Weight

High body temperature hint

Grade of waterproof

Infrared Thermometer

PC868

Forehead and object temperature modes d.c.3V, 2 pcs AAA battery

For forehead temperature: 32.0-43.0℃

For object surface temperature: 0-100℃ for forehead temperature:

± 0.2 during 35. 5℃ -42.0℃;

± 0.3 during 32.0℃ -35.4℃ and 42.1℃ -43.0℃

Within ±0.3℃

0.1℃/0.1℉

10-40℃, Relative humidity 15-85%, 70-106KPa

-25-50℃, Relative humidity ≤ 95% , 70-106KPa

123×34×21mm

35g

≥38℃

IP22

Electric shock

Applied part

Mode of operation

Product life

Internally powered ME equipment

Type BF applied part, including the whole unit

Continuous operation

5 years

Software version V1.0

Note: Not intended to be sterilized.

Not for use in an OXYGEN RICH ENVIRONMENT

*The above specifications are subject to change without prior notice.

15.

Standard list

Shenzhen PACOM Medical Instruments Co., Ltd declares that the PC868 complies with following applicable standards:

EN 980

EN 1041

EN 60601-1

EN 60601-1-2

EN 60601-1-6

EN 60601-1-11

Symbols for use in the labeling of medical devices

Information supplied by the manufacturer with medical devices

Medical electrical equipment Part 1: General requirements for basic safety and essential performance

Medical electrical equipment -- Part 1-2: General requirements for basic safety and essential performance - Collateral standard:

Electromagnetic compatibility - Requirements and tests

Medical electrical equipment – Part1-6: General requirements for basic safety and essential performance – Collateral standard: Usability

Medical electrical equipment – Part 1-11: General requirements for basic safety and essential performance – Collateral standard: Requirements for medical electrical equipment and medical electrical systems used in home

EN 12470-5

ISO 80601-2-56

EN 62304

EN 62366

EN ISO 10993-1 healthcare environment

Clinical thermometers – Part 5: Performance of infra-red ear thermometers (with maximum device)

Medical electrical equipment part 2-56: particular requirements for basic safety and essential performance of clinical thermometers for body temperature measurement

Medical device software - Software life-cycle processes

Medical devices – Application of usability engineering to medical devices

Biological evaluation of medical devices - Part 1: Evaluation and testing within a risk management process

16.

Disposal

Dispose of the device in accordance with the regulation applicable at the place of operation. Dispose of at public collection point in the EU countries – 2002/96/EC

WEEE Directive.

If you have any queries, please refer to the local authorities responsible for waste disposal.

NOTES:

● Handing of battery and wastes method, please act according to the native law to proceed to handle.

● Take out the battery if you are not going to use the unit for a long time.

To protect the environment, dispose of empty battery at your retail store or at appropriate collection sites according to national or local regulations.

Dispose of at public collection point in the EU countries – 2006/66/EC Directive.

17.

Normalized symbols

Follow operating instructions

BF type applied part

Disposal in accordance with Directive 2002/96/EC

(WEEE)

Complies with the European Medical Device

Directive (93/42/EEC and amended Directive

2007/47/EC. Notified Body is SGS FIMKO YO.

Manufacturer information: The manufacturer is:

Shenzhen PACOM Medical Instruments Co., Ltd.

Authorized representative in the European

Community. The European representative is:

Shanghai International Holding Corp. GmbH (Europe)

IP22

IP code of the device: this device’s grade of against ingress of solid foreign objects -- ≧ 12.5mm diameter (and the against access to hazardous parts with finger); the grade of waterproof is dripping (15 0 tilted).

Batch code

Date of manufacture

18. EMC DECLATION

1) The digital thermometer needs special precautions regarding EMC and needs to be installed and put into service according to the MEC information provided in the

ACCOMPANYING DOCUMENTS.

2) Wireless communications equipment such as wireless home network devices, mobile phones, cordless telephones and their base stations, walkie-talkies can effect this equipment and should be kept at least a distance d=3.3m away from the equipment.

(Note: As indicated in Table 6 of IEC 60601-1-2:2007 of ME EQUIPMENT, a typical cell phone with a maximum output power of 2W yields d=3.3m at an IMMUNITY LEVEL of 3V/ m).

19.

Guarantee

We grant you a lifetime guarantee after the date of purchase for one year. Any damage caused by improper handling shall not be covered by the guarantee. Batter and packaging are also excluded from the guarantee. All other damage claims excluded. A guarantee claim must be submitted with the purchase receipt. Please pack your defective instrument well and send with sufficient postage to the distributor.

Shenzhen Pacom Medical Instruments Co., Ltd.

Address : On the 8 th floor of B District, B Building, No.5, Industry five road, Jianbian Community,

Songgang, Shenzhen 518105, China.

Tel : 86-755-32920339

Website: www.pacom

.com

Shanghai International Holding Corp. GmbH (Europe)

Address : Eiffestrasse 80, 20537 Hamburg Germany

Tel : 0049-40-2513175

Fax : 0049-40-255726

E-mail: [email protected], [email protected]

User manual Edition: V2.1

Printed on: Sep. 2019

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Key Features

  • Forehead temperature measurement mode: Measures the skin surface temperature of the human forehead accurately.
  • Object temperature measurement mode: Measures the surface temperature of objects, such as ambient temperature.
  • Quick and accurate temperature measurement.
  • Easy-to-use with one-button operation.
  • Compact and portable design.
  • Large and easy-to-read LCD display.
  • Automatic data storage and recall.
  • Low battery indicator.
  • CE and FDA approved.

Related manuals

Frequently Answers and Questions

What is the intended use of the PACOM PC868?
The PACOM PC868 is intended for non-contact measurement of forehead temperature at home or in a hospital setting, for infants, children, and adults.
What are the different temperature measurement modes of the PACOM PC868?
The PACOM PC868 has two temperature measurement modes: forehead temperature measurement mode and object temperature measurement mode.
How do I measure forehead temperature using the PACOM PC868?
To measure forehead temperature, hold the thermometer 1-2 inches from the center of the forehead and press the measurement button.
How do I measure the surface temperature of an object using the PACOM PC868?
To measure the surface temperature of an object, hold the thermometer 1-2 inches from the surface of the object and press the measurement button.
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