Personal EMF detectors and meters



Tenmars ST-501
Air Quality Monitor (AIQ)
CO2 / Temperature /RH Monitor


Air Quality (AIQ) Monitor ST-501Tenmars ST-501 ---- $398.90 (free shipping)
Indoor Air Quality (IAQ) Monitor

Building HVAC Monitoring, Indoor Air Quality Survey, Locate Combustion Fumes.

Datalogger with USB and PC connection.      

USB-PC icon





  • 3 independent CO2, humidity and temperature sensors.
  • User operated CO2 calibration.
  • Datalogging up to 50,000 records with fast USB download.
  • Internal back-up battery to maintain the data of Date/Time.
  • Power management IC to increase battery efficiency.
  • Easy-to-use PC software or parameter setting and data analysis.
  • Building in audio CI2 buzzer/alarm.


  • CO2 Sensor- GE Dual Bean Absorption infraredTM.
  • Temperature /Humidity sensors.
  • Measurement range : 0 to 5,000 PPM.
  • Display resolution: +/-1 PPM.
  • Accurancy: +/- 75 PPM or 10% of reading.


Measurement Ranges



0 ~ 5,000 PPM

+/- 75 ppm or 10% of the reading


0 ~95% RH

2.5% at 10% to 90% RH


0ºC ~50º C

+/- 5º C @ 0 ~50ºC

Signal Update

Every 2 seconds

Warm Up Time

< 2 minutes

Operation Conditions

0ºC ~50º C (32ºF to 122ºF), 0 to 95% RH, non condensing


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