It adopts a digital temperature and humidity sensor, high precision, stable performance, anti-interference ability, low consumption, and can provide a long service time. LCD screen, you can clearly see the amount of electricity, CO2 value, TVOC value, HCHO value, temperature and humidity. Celsius and Fahrenheit switchable, and the alarm sound can be on or off according to your demands. Equipped with the environmental quality judgment function, it will display the appropriate level according to the measurement value. Built-in 1800mAh lithium battery, easy to charge with USB cable. This is a kind of high-quality quality detector, which adopts electrochemical detection module, high precision, stable performance, anti-interference ability, low consumption, and can provide a long service time. Accurately detect CO2. Big screen, you can clearly see the amount of electricity, CO2 value, TVOC value, HCHO value, temperature and humidity. You can try it. When the battery is too low, the battery frame flashes to remind you to recharge. Specs: Name: quality meter Display: LCD display Battery: 1 x built-in lithium battery, 3.7V, 1800mAh (Included) CO2 Measurement-Range: 350ppm-2000ppm TVOC measurement range: 0.000 mg / m and sup3; -2000 mg / m and sup3; HCHO measurement range: 0.000 mg / m and sup3; -1000 mg / m and sup3; Temperature Measurement-Range: 0 Celsius-90.0 Celsius (32 Fahrenheit-194 Fahrenheit), +/- 1 Celsius / +/- 1 Fahrenheit Craft Supplies: Electric Model Number: JD-3002 Quality Meter Gas type: CO With LCD Screen Or Not: Yes Measurement range: 350ppm-2000ppm color: Black Material: plastic Package Contents: 1 x Quality Tester 1 x USB cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.