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Formaldemeter™ htV-M

With the subject of Indoor Air Quality becoming more prominent and recognised throughout many different industries, it has become essential to be able to accurately monitor low levels of indoor pollutant gases.

The Formaldemeter htV-M offers the same precise 3 parameter monitoring for low levels of hazardous formaldehyde vapours under extremes of temperature and humidity as seen in the world-wide success of the Formaldemeter htV but with the addition of these impressive extra features:

  • A built in non-volatile memory that can be upgraded.
  • Capable of up to one month of continuous monitoring.
  • A real time clock.
  • Built in alarm
  • Mains or battery powered.
  • Can be used as a manual hand held and a continuous monitoring data logger.
  • USB interface allowing direct connection to a PC for downloading data.
  • Supplied with the htV-M download software.
  • Manufactured to ISO 9001:2015 quality standards and compliant to CE regulations.
  • Optional Wifi Module available. Click here for more info.







The htV-M can precisely measure formaldehyde concentrations in parts per million (ppm) and mg/m3 over a wide range of temperature and humidity. Fast and easy to use, pressing a single button gives an immediate indication of concentration levels. The improved Formaldemeter htV-M is reliable and simple to calibrate. The compact size means the htV-m is small enough to be used as a hand held device. The built in memory and real time clock enables the htV-m to log all 3 parameters and corresponding times, allowing improved monitoring and analysis opportunities. Alternatively a PC can automate the sampling and log data at specific times by a direct or wireless connection. This is advantageous as it allows the user more freedom and is a cost effective approach to taking such measurements.





Easy to use, four button interface.
DC Socket and USB connection
Built in Stand

The Formaldemeter htV-M has the same simple 4 button layout as the htV, 400 and Glutaraldemeter units.

One button to turn on and another to sample. By pressing particular button combinations together, the user can access temperaure and humidity readings, check the gain and also calibrate the unit with the provided Formaldehyde standard.



The built in DC socket allows the htV-M to be powered by the mains if used as a continuous data logger, so as to save the internal battery of the unit.

The mini USB socket allows data to be downloaded quickly and easily to the PC using the supplied htV-m download software


A simple fold out stand allows the htV-M to sample in an upright position, while also providing a better viewing angle for checking formaldehyde levels on the display.








Sampling Method 10ml snatch-sample of air taken by internal pump.
Sampling Frequency 2 minutes in normal IAQ conditions.
Response Time 60 seconds in 'high accuracy' mode,
approx. 8 seconds in 'lower accuracy' mode.
Mechanical 150 x 80 x 34mm ABS plastic case.
Padded accessory-case 313 x 265 x 77mm.
Weight 300g with 9v PP3 alkaline battery
Total kit weighs 1.2Kg.


Formaldehyde Sensor


Type Electrochemical manufactured by PPM Technology..
Range 0-10ppm as standard (0- 12.3 mg/m³ at 25°C).
Extended range available on request.
Resolution 0.01 ppm
Accuracy 10% at 2ppm
Precision 94% of all instrument readings meet the NIOSH criteria for an acceptable method when measuring 0.3ppm of formaldehyde over a relative humidity range of 25-70%. The NIOSH criterion for acceptability is that all results fall within ±25% of the true value at the 95% confidence level.
Calibration By user with supplied calibration standard or by original manufacturer.


Temperature & Humidity Module


Type Interchangeable digital CMOSens®..
Range -40 to +128°C, 0–100% RH
Accuracy ±0.4°C, ±3% RH
Optional upgrade to ±0.3°C, ±1.8% RH
Calibration Calibrated to ISO/IEC17025 by manufacturer. Traceable by the ‘National Institute of Standards and Technology' and the ‘National Physical Laboratory'.


Kit Contents


  • Formaldemeter htV-M instrument with battery
  • Formaldehyde calibration standard tube
  • USB Cable
  • Pack of phenol filters (10)
  • Digital copy of manual
  • Mains Adapter
  • Download Software




  • Calibration Standard: PPM supplies an easy-to-use formaldehyde calibration standard tube for checking and adjusting the calibration of the Formaldemeter htV-M. The tube produces a known concentration of formaldehyde vapour that can be sampled by the instrument to check accuracy and performance. The standard has a 100-sample capacity or a useful life of six months (whichever occurs sooner).
  • Wall mounted cradle.



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