RAINB Indoor Air Quality Tester Detector Portable Co2 Formaldehyde Detector Testingkit Feature *5-in-1 Portable Air Quality Monitor. This indoor air quality monitor provides accurate results for many air quality measurements, including Carbon Dioxide(CO2), Formaldehyde(HCHO), Volatile Organic Compounds(TVOC), Temperature and Humidity. The temperature unit of the home air quality tester supports conversion between Celsius and Fahrenheit, and there is a MAX button for viewing the maximum data in the current test record. *The air quality detector is responsive, the detected data is displayed on a screen, and then the system evaluates the risk level (GOOD or OK or POOR), and when the value exceeds the normal range, the buzzer sounds quickly. Mute button: Turn on or turn off the alarm sound. In silent mode, the mute symbol is not displayed and there is no alarm sound. The alarm sound is turned on by default. *The carbon dioxide detector have a built-in 1000mAh rechargeable lithium battery, with a USB cable. When the battery is fully charged, the formaldehyde detector can last for 6-7 hours. When the battery power is too low, the battery frame will flash to remind the user to charge, while charging, the characters in the battery frame will flash in sequences until the battery symbol is fully displayed when the battery is fully charged. *The indoor air quality monitor adopt an updated digital temperature and humidity sensor, and the high-precision sensor identifies and captures different pollutants in the mixed gas to ensure the accuracy of the measurement of various indicators. The air quality analyzer help monitor is widely used in the home, office, car, kitchen, bedroom, gym, hotel, camping, party and more. *The handheld air quality tester is made of ABS material, and the excellent performance of high-temperature resistance and impact resistance makes the air pressure meter have a long service life. The large display screen supports LCD backlight to make the operation more convenient and the displayed data clearer and easier to read. Short press the backlight button to turn off or enable the backlight function. Specification Name: Air Quality Detector CO2 measuring range: 385ppm ~ 2000ppm TVOC measuring range: 0.000 mg/m³ ~ 2.000 mg/m³ HCHO measuring range: 0.000 mg/m³ ~ 1.000 mg/m³ Temperature measurement range: 0℃ ~ 90.0℃ / 32℉ ~ 194℉ Humidity measurement range: 0~90%RH Power supply: built-in 3.7V lithium battery Battery duration: 6-7 hours Instructions -Mute Button: Turn on or turn off the alarm sound. In silent mode, the mute symbol is not displayed and there is no alarm sound. The alarm sound is turned on by default. -Backlight Button: press to turn off or enable the backlight function. -Maximum Data Button: View the maximum data in the current test record. -Calibration Button: Press and hold for 5 seconds, the air quality data will be cleared and re-tested. -Temperature Unit Selection Button: Convert between Celsius and Fahrenheit. -Power Button: long press for 5 seconds to hear a beep, turning the power on or off. When turned on, the number on the screen starts from 120 and counts down to 0. (It is recommended to leave it in a ventilated place for 20 minutes before turning it on) Packing List 1*Air Quality Monitor 1*USB Cable 1*User manual Brand new and high quality. Convenient to use. Durable and practical. Made of high quality material, durable and practical to use. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Please allow slight manual measurement deviation for the data.