The Uni-t gas meter monitors the concentration of carbon dioxide (CO2) in the atmospheric air. The main features include:

• CO2 measurement range: From 400 ppm (0.04%) to 5000 ppm (0.5%)
• Automatic calibration: The device is capable of automatically calibrating the CO2.
• Measurement time: Measures the CO2 value every 3 seconds.
• Display functions: By pressing the MODE button, it can display HOLD, maximum (MAX), minimum (MIN), average (AWG) values, and TWA or STEL.
• Alerts: There are audible and visual alarms if the CO2 concentration is > 1000 ppm.
• Temperature and Humidity: Measures temperature and relative humidity.
• Display: LCD with backlight, dimensions 42 x 65 mm.
• Rechargeable battery: Contains a rechargeable 3.7 V DC Li-ion battery, charged via the supplied micro USB/USB cable.
• Product dimensions: 75 x 55 x 130 mm.
• CO2 measurement accuracy: ± (5% rdg + 50ppm) in the range 400ppm ~ 2000ppm.
• Temperature measurement range: 10 °C to 0 °C, with an accuracy of ± 1 °C.
• Humidity measurement range: 0% RH ~ 99% RH with a typical deviation of ± 5% RH (10% RH ~ 90% RH) at 25 °C.