UNI-T A37 Carbon Dioxide Monitor Portable CO2 Meter with 1500mAh Rechargeable Battery High Accuracy CO2 Detector for Carbon Dioxide Air Quality Monitor

Features:
3-inch HD Large LCD Screen Display: simultaneously display CO2 concentration, temperature and humidity, date and time.
Audio and Visual Alarm: the CO2 data will upgrade every 3 seconds, once it exceed 1000ppm, it will make sounds and the backlight will turn red.
Air Quality is Indicated with Emoticons: according to the CO2 concentration, there are 6 kind of emotion icons to indicate the current air quality.
NDIR Infrared Sensor Adopted: professional non-dispersive infrared(NDIR) provide fast and high accuracy measurement results.
Rechargeable Battery Power Supply: 1500mAh great capability 3.7V polymer lithium battery, and built-in with power protection chip to ensure security.
Automatic and Manual Calibration Function: perfect for various working environments and conditions.
Wide Applications: can be used in homes, shopping malls, offices, vehicles, stations, laboratory, cleanroom, greenhouse, CO2 storage room, and more.