The Quality Tester is widely used in homes, offices, enterprises, governments, schools etc.The display of Quality Tester is equipped with a 2.8-inch LCD display, which directly and clearly displays each piece of data (/ and ppm), while providing average value, real-time value, and environmental recommendations to perfectly display quality.The easy-to-read numbers and the support of the alarm sound will let you know if your is unsafe. -type Dust Tester. -in 1200 mAn rechargeable battery is included. A USB cable, standby time can last 4-6 hours.The Quality Test Formaldehyde Detector with -in electric chemical sensors can accurately detect carbon dioxide (CO2), formaldehyde (HCHO), volatile organic compounds (TVOC) and particulate matter (PM2.5/PM10) in the . These readings involve the detection of toluene, harmful chemicals and pollutants in the .Formaldehyde Detector. Widely used in homes, offices, enterprises, governments, schools and automobiles. Detect problems at any time to the health of family members or employees.The unique mold designed Pollution Meter with LCD color digital display can an average value for each gas, because long-term real-time data is unstable.Specification quality test formaldehyde detectorDetection error: Less than 15%Formaldehyde detection range: 0.000-1.999mg/mTVOC detection range: 0.000-1.999mg/mPM1.0/PM2.5/PM10 detection range: 0-999ug/mTemperature measurement range: 0-50 CelsiusHumidity measurement range: 20~90%RHBattery: 1200mAh lithium batteryStandby time: about 240-360 minutesCharging time: about 4 hoursLife time: about 2 hoursUSB interface: Type-C interfaceInput voltage: 5V/1AWorking environment: 5-40 Celsius, Less than 90%RHColour:Black orangeMaterial:plasticPackage Contents:1 * Quality Tester1 * USB Charging Cable1 * English manualOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.