Air Quality Monitor Formaldehyde HCHO TVOC PM2.5 LCD Digital Detector

Features: Compact mini and easy to carry. Used to monitor air quality and protect family health. Suitable to Home(Kitchen, Bedroom and etc.) Office, Car,ect. LCD digital screen display, easy to read test results, more convenient for indoor air detection. Adopting 12 bit AD smart chip with digital detection signal amplification, hardware and software arithmetic, more precise reading. Specifications: Color: Black White Weight: 235g Material: ABS Display Mode: LED USB Cable Length: 51cm Input: 5.0V/500mA Power Supply: Rechargeable Lithium Battery 2200mAh(not included) Charging Method: USB Charging Time: 4h Working Time: 5~6h(Fully charged) Operating Voltage: 2.5~3.2V Testing items: Formaldehyde, TVOC,PM2.5 Test Principle: Principle Of Aemiconductor Gas Sensor Test Range: HCHO: 0.000-2.888mg/m3 TVOC: 0.000-9.999 mg/m3 How to see the numerical value? 1.When the concentration of formaldehyde is 0.1mg/m it means that the concentration of formaldehyde in the surrounding air is within the safe range of the national standard, indicating good air quality. 2.When the formaldehyde concentration is 0.1mg/m115, it indicates that the ambient air concentration is excessively polluted. It is recommended to open the window immediately to maintain air circulation. 3.When the formaldehyde concentration is >0.3mg/m3, or PM2.5>250, it means that the ambient air concentration is seriously exceeding the standard. The buzzer sounds "drop" "drop" and "drop" five times. It is recommended to open the window immediately to keep the air flowing. And always pay attention to the indoor air quality, it is best to do a comprehensive air treatment indoors. Charging Instructions: 1.USB charging 2. The charging time is about 4 hours. When charging, the LED light flashes; when it is full, the LED light stops flashing. Note: The product is in the power-on detection state during charging. Usage Method: 1. After receiving the new machine for 2 hours (shutdown) it does not need ventilation for the second time. 2. After boot the 200-second countdown is completed, ventilate for 5 minutes in the outdoor. 3. Then press and hold the middle button to calibrate. After hearing the beep, take the indoor test. 4. Stay for about 3-5 minutes to read (each boot needs calibration). Note: (The test point is closed at least 12 hours in advance.) The above HCHO is the formaldehyde value, which is normal within 0.100, and abnormal when it is greater than 0.100; The following TVOC is the numerical value of harmful substances in the air. It is normal between 0.100 and 0.600, and abnormal when it is greater than 0.600. Precautions for calibration: 1. The outdoor air is pure during calibration 2. Good ventilation conditions 3. Avoid blowing on the mouth during calibration and testing, away from perfume, alcohol, cosmetics, soot, industrial pollution areas, to avoid interference with the normal equipment. 4. The test space is closed for more than 12 hours and then tested. Note: 1.Due to the light and screen difference, the item's color maybe slightly different from the pictures. Please understand. 2.Please allow 0.5-1 inch difference due to manual. Package Included: 1 x Air Quality Monitor 1 x USB Cable 1 x Manual Details pictures: