The Air Quality Tester is widely used in homes, offices, enterprises, governments, schools etc. The display of Air Quality Tester is equipped with a 2.8-inch LCD display, which directly and clearly displays each piece of air data (ug/m3 and ppm), while providing average value, real-time value, and environmental recommendations to perfectly display air quality. The easy-to-read numbers and the support of the alarm sound will let you know if your air is unsafe. Micro-type Dust Tester. Built-in 1200 mAn rechargeable battery is included. A USB cable, standby time can last 4-6 hours. The Air Quality Test Formaldehyde Detector with built-in electric chemical sensors can accurately detect carbon dioxide (CO2), formaldehyde (HCHO), volatile organic compounds (TVOC) and particulate matter (PM2.5/PM10) in the air. These readings involve the detection of toluene, harmful chemicals and pollutants in the air. Formaldehyde Detector. Widely used in homes, offices, enterprises, governments, schools and automobiles. Detect air problems at any time to ensure the health of family members or employees.The unique mold designed Air Pollution Meter with LCD color digital display can provide an average value for each gas, because long-term real-time data is unstable., Manufacturer: HIJYMNZPQ