TESTO Digital CO₂ measuring instrument Owner's Manual

Below you will find brief information for CO2 Meter 535. This handy, robust instrument measures ambient CO2 levels, ideal for indoor climate evaluation, HVAC system checks and ventilation system monitoring. It features Bluetooth connectivity with the testo Smart App for data logging and analysis, alarm thresholds, and various measurement modes like multi-point and continuous mean calculation.

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testo 535 Instruction Manual: CO2 Meter | Manualzz

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Key features

  • Bluetooth connectivity with testo Smart App
  • Adjustable alarm thresholds
  • Data logging and analysis capabilities
  • User-friendly interface
  • Compact and portable design
  • Measures ambient CO2 levels

Frequently asked questions

The display will show a low battery indicator. Replace the battery.

This could be due to a sensor error or very low ambient temperature. Check the temperature and contact customer service if the problem persists.

Press the left arrow key several times until 'Max' or 'Min' is displayed. Then hold down the left arrow key for about 2 seconds.

Press the MODE/END key. Press MENU/ENTER to record readings. Press MODE/END again to end measurement and calculate the mean.

Press and hold the MENU/ENTER key for approximately 2 seconds.
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