Instrument instructions:
1. After the test, the power of the equipment must be turned off to avoid accidents
2. Prevent the instrument from violent vibration
3. After placing the instrument for a long time, the odor gas will accumulate in the instrument, which will seriously affect the test results, in this case, the instrument must be placed in a cool and ventilated place, and then used for more than 1 hour (no operation is required during the ventilation process instrument)
4. The expired and defective products should be repaired in time.
5. Avoid shocking the sensor with gas higher than the measurement range, otherwise it may damage the sensor, and man-made damage is not covered by the warranty

Instrument introduction:
1. Digital temperature and humidity sensor
2. LCD display
3. Mute button: Turn on or off the alarm sound. In the silent mode, the " " symbol is not displayed and there is no alarm sound. The default is to turn on the sound
4. "+" button: When setting the alarm value, increase the value.
5. Power button: long press for 2 seconds to turn on or off the power, when power on, the number field counts down from 120
6. Temperature unit selection button: Celsius and Fahrenheit conversion
7. "-" button: When setting the alarm value, decrease the value
8. Setting button: Short press this button to set the alarm value of "CO2→TVOC→HCHO" in sequence, the original factory setting value will be displayed and flashing, and the parameter will be adjusted by the "+" button and "-" button, and the value will be displayed after 10 seconds. automatic storage
9. Power supply: DC5V built-in 1800mAh lithium battery
10. Dimensions: 195x95x35mm
11. Carton packaging weight: 270 grams

Display content introduction:
1. Alarm sound: press the "mute button" to operate
2. CO2 measurement range: 350ppm～2000ppm
3. TVOC measuring range: 0.000 mg/m3～2.000 mg/m3
4. HCHO measuring range: 0.000 mg/m3～1.000 mg/m3
5. Temperature display: press the "temperature unit selection button" to operate
6. Measuring range: 0-90.0 degrees Celsius, 32-194 degrees Fahrenheit
7. Environmental quality reminder: excellent, the detection value is lower than the set value; good, the CO2 detection value is 50ppm higher than the set value
8. The TVOC detection value is 0.01 mg/m3 higher than the set value
9. The detected value of HCHO is 0.03 mg/m3 higher than the set value
10. Pollution: Buzzer fast sound alarm
11. The detected value of CO2 is 100ppm higher than the set value
12. The TVOC detection value is 0.02 mg/m3 higher than the set value
13. The detected value of HCHO is 0.06 mg/m3 higher than the set value
14. When the battery power is too low, the battery box will flash to remind the user to charge
15. When charging, the characters in the battery frame will flash in sequence until the battery symbol is fully displayed when the battery is fully charged
16. Humidity measurement range: 0～99.0RH

important hint:
1. Before use, please read the following detailed introduction carefully, and use the instrument correctly according to the manual
2. Do not disassemble the instrument or throw it into fire
3. Avoid operating the instrument in a strong wind environment
4. Avoid shock and drop
5. If it is not used for a long time, the warm-up time for the power-on will be longer
6. Note: Do not let liquid flow into the instrument