Model-AQH-20

Indoor Air Quality Meter – CO₂, Temp, Humidity % with Backlit LCD

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

See Product Overview

Model-AQH-20

From ^$ 457.24

Shop Models

1 Variations available

See all series options below

Data Sheet

Product Overview

Accuracy Detail Temperature Accuracy: ± 0.9 °F; CO2 Accuracy: ± 30 PPM; Humidity Accuracy: ± 3 %
Battery Size and Type Alkaline AA
CO2 Measurement Range 0 to 2000 PPM
Display Note 4 digits for temperature/CO2 and 3 digits for humidity.
Display Type LCD
Humidity Response Time < 10 minutes
Operating Humidity 0 to 95% RH
Operating Temperature, Max 122 °F
Operating Temperature, Min 32 °F
Process Temperature, Max 140 °F
Process Temperature, Min 14 °F
Relative Humidity 0 to 99.9%
Resolution Note Temperature Resolution: 0.1 °F; CO2 Resolution: 1 PPM; Humidity Resolution: 0.1%
Response Time Temperature Response time < 2 minutes; CO2 Response time < 30s
Sensor Type CO2 Sensor: Non-dispersive infrared
Series ID Model-AQH-20
Supply Power Note (4) 1.5 V AA alkaline batteries, included, user replaceable
Supply Power Type Battery
Warm Up Time 30 sec
Weight 6.76 oz

Supported Applications

The Model AQH-20 Handheld Indoor Air Quality Meter reduces the number of instruments a contractor has to carry by measuring carbon dioxide concentration, air temperature, and relative humidity in a single device. A large backlit LCD shows all three parameters simultaneously, and the meter can display dew point or wet bulb temperature in place of ambient temperature.

Indoor air quality checks, reading CO2, temperature, and humidity together during walk-throughs.
HVAC and ventilation troubleshooting, with user-selectable engineering units and minimum, maximum, and average readings.
Spot measurements and logging comparisons, aided by a hold function and an audible alarm.

For accurate readings, the CO2 sensor should be calibrated in fresh outdoor air that is well ventilated and in good weather conditions; it should not be calibrated in areas with high CO2 concentrations such as crowded areas. When the meter experiences a large variation in environment, it may take 30 seconds to respond.

Operating Conditions & Performance

The AQH-20 uses a non-dispersive infrared (NDIR) CO2 sensor alongside temperature and humidity sensing:

CO2: range 0 to 2000 ppm; accuracy ±30 ppm ±5% of reading; resolution 1 ppm.
Temperature: range 14 to 140°F (-10 to 60°C); accuracy ±0.9°F (±0.6°C); resolution 0.1°F (0.1°C).
Relative humidity: range 0.0 to 99.9% RH; accuracy ±3% RH (10 to 90%), ±5% (0.0 to 9.9% or 90 to 99.9%); resolution 0.1% RH.
Response time: CO2 < 30 seconds; temperature < 2 minutes; humidity <10 minutes.

The display shows four digits for temperature/CO2 and three digits for humidity, and warm-up time is 30 seconds. The meter operates from 32 to 122°F (0 to 50°C) at 0 to 95% RH (non-condensing) and is powered by four 1.5 V AA alkaline batteries, included and user replaceable. It weighs 6.76 oz (200 g) and carries CE approval.

Configuration Options

The AQH-20 is a single-model meter, so every unit provides the same three-parameter measurement set — CO2 from 0 to 2000 ppm, temperature from 14 to 140°F (-10 to 60°C), and humidity from 0.0 to 99.9% RH — along with the same backlit LCD, NDIR CO2 sensor, and selectable dew-point/wet-bulb display. There are no separate capability tiers within the series.