Handheld Carbon Dioxide Tester With Temperature & Humidity 1. CO2 measurement range: 0-9999ppm (2001~9999ppm reference value) 2. Temperature measurement range: -10-60 degrees Celsius (14-140 degrees Fahrenheit) 3. Relative humidity measurement range: 0.1%~99.9%RH 4. Dew point temperature measurement range: -20.0~59.9 degrees Celsius 5. Wet bulb temperature measurement range: -5.0~59.9 degrees Celsius 6. Resolution: 1ppm, 0.1 degrees Celsiusdegree Fahrenheit, 0.1%RH 7. Warm-up time: 30 seconds 8. Power supply: 4xAA (not included) 9. ??Dimensions: 205x70x56mm 10. Weight: 200g Product features: 1. LCD screen displays CO2 concentration, temperature and humidity at the same time 2. NDIR detection element senses CO2 concentration 3. Switchable display 4. TWA (8-hour weighted average C02) STEL (15-minute weighted average CO2) 5. Backlight allows users to operate in the dark 6. Alarm value can be set 7. Battery or transformer can be used as power supply, CO2 and humidity values ??can be easily calibrated 8. Can be connected to a computer to download readings instantly Applicable scenarios: 1. Install a CO2 and temperature detector in the breeding house and connect it to the fan to monitor the above data at any time. When the CO2 concentration exceeds the standard, the monitor will alarm and start the fan to automatically replace fresh air, while monitoring the temperature and ventilation rate of the pen at any time 2. Installing a CO2 detector in a plastic greenhouse can ensure timely alarm when the CO2 detector concentration is insufficient, so as to use gas fertilizer, ensure vegetables, fungi, flowers, Chinese medicine, etc. are put on the market early, high quality and high yield 3. When school teachers are in class, if the window is not opened for a long time, the CO2 concentration will increase, reducing learning efficiency. If a CO2 monitor is placed in the classroom, the air quality can be guaranteed, thereby improving learning and work efficienc