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

Tenmars 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.      

 Features:

• 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.

Specs:

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