TESTO Digital thermometer, 925 Owner's Manual
Testo Digital Thermometer 925 is a compact instrument for measuring temperatures, ideal for HVAC applications and surface temperature measurements. It features Bluetooth connectivity for use with the testo Smart App, allowing for data logging, analysis, and report generation. The device offers various measurement modes including continuous and multi-point mean calculations, adjustable alarm thresholds, and selectable units (metric/imperial). Battery-powered for portability.
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testo 925 – Thermometer for TC type K
0560 0925
Instruction manual
0560 0925
Instruction manual

Contents
Contents
1 About this document ...........................................................................3
2 Safety and disposal..............................................................................3
2.1 Security ..................................................................................................3
2.2 Disposal .................................................................................................4
3 Product-specific information...............................................................4
4 Intended use .........................................................................................5
5 Product description .............................................................................5
5.1 Instrument overview ...............................................................................5
6 First steps .............................................................................................6
6.1 Inserting / changing batteries .................................................................6
6.2 Getting to know the product ...................................................................7
6.2.1 Connecting probes .................................................................................7
6.2.2 Switching the instrument on and off .......................................................7
6.2.3 Switching the display illumination on and off ..........................................7
6.3 Establishing a Bluetooth ® connection .....................................................8
6.3.1 Establishing a Bluetooth ® connection to the testo Smart App ................9
7 Using the product...............................................................................10
7.1 Controls on the measuring instrument..................................................10
7.1.1 Implementing settings ..........................................................................11
7.1.2 Opening configuration mode ................................................................12
7.1.3 Setting the unit .....................................................................................12
7.1.4 Setting alarm thresholds.......................................................................13
7.1.5 Setting the alarm sound .......................................................................13
7.1.6 Carrying out a reset of the setting menus.............................................13
7.1.7 Carrying out a reset of the measuring instrument.................................13
7.2 Measuring ............................................................................................14
7.2.1 Freezing a reading, displaying the maximum/minimum value ..............14
7.2.2 Resetting maximum/minimum values ...................................................14
7.2.3 Carrying out multi-point mean calculation ............................................15
7.2.4 Carrying out continuous mean calculation ............................................16
7.3 Printing data .........................................................................................17
8 Controls via testo Smart App ............................................................18
8.1 Overview of operating controls .............................................................18
8.2 App options ..........................................................................................20
Contents
1 About this document ...........................................................................3
2 Safety and disposal..............................................................................3
2.1 Security ..................................................................................................3
2.2 Disposal .................................................................................................4
3 Product-specific information...............................................................4
4 Intended use .........................................................................................5
5 Product description .............................................................................5
5.1 Instrument overview ...............................................................................5
6 First steps .............................................................................................6
6.1 Inserting / changing batteries .................................................................6
6.2 Getting to know the product ...................................................................7
6.2.1 Connecting probes .................................................................................7
6.2.2 Switching the instrument on and off .......................................................7
6.2.3 Switching the display illumination on and off ..........................................7
6.3 Establishing a Bluetooth ® connection .....................................................8
6.3.1 Establishing a Bluetooth ® connection to the testo Smart App ................9
7 Using the product...............................................................................10
7.1 Controls on the measuring instrument..................................................10
7.1.1 Implementing settings ..........................................................................11
7.1.2 Opening configuration mode ................................................................12
7.1.3 Setting the unit .....................................................................................12
7.1.4 Setting alarm thresholds.......................................................................13
7.1.5 Setting the alarm sound .......................................................................13
7.1.6 Carrying out a reset of the setting menus.............................................13
7.1.7 Carrying out a reset of the measuring instrument.................................13
7.2 Measuring ............................................................................................14
7.2.1 Freezing a reading, displaying the maximum/minimum value ..............14
7.2.2 Resetting maximum/minimum values ...................................................14
7.2.3 Carrying out multi-point mean calculation ............................................15
7.2.4 Carrying out continuous mean calculation ............................................16
7.3 Printing data .........................................................................................17
8 Controls via testo Smart App ............................................................18
8.1 Overview of operating controls .............................................................18
8.2 App options ..........................................................................................20

Contents
8.2.1 Setting the language ............................................................................ 20
8.2.2 Displaying App Info .............................................................................. 20
8.2.3 Displaying the tutorial .......................................................................... 20
8.3 Application menus ............................................................................... 21
8.3.1 Selecting an application menu ............................................................. 21
8.3.2 Setting favourites ................................................................................. 21
8.3.3 Displaying information about an application ........................................ 21
8.4 Making measuring instrument settings ................................................ 22
8.4.1 Configuring the measuring instrument menu ....................................... 24
8.4.2 Setting Auto Off ................................................................................... 25
8.4.3 Activating damping .............................................................................. 25
8.4.4 Configuring alarms............................................................................... 26
8.4.5 Setting the surface increment .............................................................. 26
8.5 Display of the readings ........................................................................ 27
8.6 Adjusting the view ................................................................................ 27
8.7 Exporting readings ............................................................................... 28
8.7.1 Excel (CSV) Export .............................................................................. 29
8.7.2 PDF Export .......................................................................................... 29
8.8 Perform Firmware update .................................................................... 30
9 Maintaining the product .................................................................... 31
9.1 Inserting / changing batteries ............................................................... 31
9.2 Cleaning the instrument ....................................................................... 31
10 Technical data for testo 925.............................................................. 32
11 Tips and assistance........................................................................... 33
11.1 Questions and answers ....................................................................... 33
11.2 Accessories and spare parts................................................................ 34
8.2.1 Setting the language ............................................................................ 20
8.2.2 Displaying App Info .............................................................................. 20
8.2.3 Displaying the tutorial .......................................................................... 20
8.3 Application menus ............................................................................... 21
8.3.1 Selecting an application menu ............................................................. 21
8.3.2 Setting favourites ................................................................................. 21
8.3.3 Displaying information about an application ........................................ 21
8.4 Making measuring instrument settings ................................................ 22
8.4.1 Configuring the measuring instrument menu ....................................... 24
8.4.2 Setting Auto Off ................................................................................... 25
8.4.3 Activating damping .............................................................................. 25
8.4.4 Configuring alarms............................................................................... 26
8.4.5 Setting the surface increment .............................................................. 26
8.5 Display of the readings ........................................................................ 27
8.6 Adjusting the view ................................................................................ 27
8.7 Exporting readings ............................................................................... 28
8.7.1 Excel (CSV) Export .............................................................................. 29
8.7.2 PDF Export .......................................................................................... 29
8.8 Perform Firmware update .................................................................... 30
9 Maintaining the product .................................................................... 31
9.1 Inserting / changing batteries ............................................................... 31
9.2 Cleaning the instrument ....................................................................... 31
10 Technical data for testo 925.............................................................. 32
11 Tips and assistance........................................................................... 33
11.1 Questions and answers ....................................................................... 33
11.2 Accessories and spare parts................................................................ 34

1 About this document
3
1 About this document
• The instruction manual is an integral part of the instrument.
• Keep this documentation to hand so that you can refer to it when necessary.
• Always use the complete original instruction manual.
• Please read this instruction manual through carefully and familiarize yourself
with the product before putting it to use.
• Hand this instruction manual on to any subsequent users of the product.
• Pay particular attention to the safety instructions and warning advice in order
to prevent injury and damage to the product.
2 Safety and disposal
2.1 Security
General safety instructions
• Only operate the product properly, for its intended purpose, and within the
parameters specified in the technical data.
• Do not apply any force.
• Do not operate the instrument if there are signs of damage to the housing or
connected cables.
• Dangers may also arise from objects to be measured or the measuring
environment. Always comply with the locally valid safety regulations when
carrying out measurements.
• Do not store the product together with solvents.
• Do not use any desiccants.
• Only perform maintenance and repair work on this instrument that is
described in this documentation. Follow the prescribed steps exactly when
doing the work.
• Use only original spare parts from Testo.
Batteries
• Improper use of batteries may cause the batteries to be destroyed, or lead to
injury due to current surges, fire or escaping chemicals.
• Only use the batteries supplied in accordance with the instructions in the
instruction manual.
• Do not short-circuit the batteries.
• Do not take the batteries apart and do not modify them.
3
1 About this document
• The instruction manual is an integral part of the instrument.
• Keep this documentation to hand so that you can refer to it when necessary.
• Always use the complete original instruction manual.
• Please read this instruction manual through carefully and familiarize yourself
with the product before putting it to use.
• Hand this instruction manual on to any subsequent users of the product.
• Pay particular attention to the safety instructions and warning advice in order
to prevent injury and damage to the product.
2 Safety and disposal
2.1 Security
General safety instructions
• Only operate the product properly, for its intended purpose, and within the
parameters specified in the technical data.
• Do not apply any force.
• Do not operate the instrument if there are signs of damage to the housing or
connected cables.
• Dangers may also arise from objects to be measured or the measuring
environment. Always comply with the locally valid safety regulations when
carrying out measurements.
• Do not store the product together with solvents.
• Do not use any desiccants.
• Only perform maintenance and repair work on this instrument that is
described in this documentation. Follow the prescribed steps exactly when
doing the work.
• Use only original spare parts from Testo.
Batteries
• Improper use of batteries may cause the batteries to be destroyed, or lead to
injury due to current surges, fire or escaping chemicals.
• Only use the batteries supplied in accordance with the instructions in the
instruction manual.
• Do not short-circuit the batteries.
• Do not take the batteries apart and do not modify them.

































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Key features
- Bluetooth connectivity
- Multi-point/Continuous mean calculations
- Adjustable alarm thresholds
- Data logging via app
- Metric/Imperial units
Frequently asked questions
Press the On/Off key for 0.5 seconds. The current reading will be displayed.
Enter configuration mode (press MENU/ENTER), select "UNITS", then use the ◄/► keys to choose between "METR" (metric) and "IMPER" (imperial), confirming with MENU/ENTER.
Press the ◄ key until 'Max' or 'Min' is displayed, then hold down the ◄ key for approximately 2 seconds.
Yes, a testo Bluetooth®/IRDA printer (order no. 0554 0621) can be used. Press and hold the ► key to print data.
In configuration mode, select "ALARM SOUND" and use the ◄/► keys to choose between "ON" and "OFF", confirming with MENU/ENTER.