Model AQH-20 Handheld Indoor Air Quality Meter

Measures CO2, Temperature and Humidity

The Model AQH-20 Indoor Air Quality Meter reduces the number of instruments a contractor has to carry by measuring the carbon dioxide concentration, air temperature, and humidity percentage in one device. A large backlit LCD display shows all three parameters simultaneously. The Model AQH-20 can display dew point or wet bulb temperatures in place of the ambient temperature. Minimum, maximum, and average readings are easily accessible through the function buttons. By pressing the hold key, the current values are held so that they can be recorded. An audible alarm warns the user that the current ambient conditions are becoming hazardous. The Model AQH-20 includes a hard carrying case and batteries.

Product Applications

  • Building commissioning
  • Green house monitoring

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

COVID-19 Update: Due to high customer demand, lead time on some products may be up to two weeks. While this is a developing health situation, we are working continuously to take the necessary measures to ensure that the products you need are available with minimal interruption.

Model Description Usually Ships* Price Order
Ships: Same Day
Price: $295.00
Handheld indoor air quality meter. Same Day* $295.00 Order


CO2: 0 to 2000; Temperature: 14 to 140°F (-10 to 60°C); Relative Humidity: 0.0 to 99.9% RH.
CO2: ±30 ppm ±5% of reading; Temperature: ±0.9°F (±0.6°C); Humidity: ±3% RH (10 to 90%), ±5% (0.0 to 9.9% or 90 to 99.9%).
CO2: 1 ppm; Temperature: 0.1°F (0.1°C); Humidity: 0.1% RH.
Response Time:
CO2: < 30 s.; Temperature: < 2 m.; Humidity: < 10 m.
4 digits for temperature/CO2 and 3 digits for humidity.
CO2 Sensor:
Non-dispersive infrared.
Temperature Limits:
32 to 122°F (0 to 50°C).
Humidity Limits (Non-Condensing):
0 to 95% RH.
Power Requirements:
(4) 1.5 V AA alkaline batteries, included, user replaceable.
Warm Up Time:
30 s.
6.76 oz (200 g).
Agency Approvals:


  • All-in-one unit for carbon dioxide, temperature, and humidity
  • Large backlit LCD for visibility in dark areas
  • User configurable alarms for audible indication of hazardous conditions

Product Literature


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