I. Attention:
a) Before use, please read the following detailed introduction carefully and use the instrument correctly according to the manual.
b) It is forbidden to disassemble the instrument or throw it into fire.
c) Avoid operating the instrument in a strong wind environment.
d) Avoid shaking and falling.
e) If it is not used for a long time, the warm-up time for the first startup will be longer.
f) Note: Do not let liquid flow into the inside of the instrument.

II. Instructions for Use of the Instrument:
a) After tests, the power supply of the equipment must be turned off to avoid accidents.
b) Prevent severe vibration of the instrument.
c) After placing the instrument for a long time, odorous gas will accumulate in the instrument, which will seriously affect 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 need to operate the instrument during ventilation)
d) Products that have expired and are defective should be repaired in time.
e) Avoid shocking the sensor with gas higher than the measurement range, otherwise the sensor may be damaged, and users should bear responsibility for their man-made damage.

Four. Device Introduction:
1. Digital temperature and humidity sensor.
2. LCD display.
3. Mute button: Turn on or off alarm sound. In silent mode, the "" symbol is not displayed and there is no alarm sound. It turns on the alarm sound by default.
4. + button: When setting the alarm value, it increases the value.
5. Power button: Long press for 2 seconds to turn on or off power supply. When powering on, the number field counts down from 120.
6. Temperature unit selection button: Conversion between Celsius and Fahrenheit.
7. - button: When setting alarm value, it decreases the value.
8. Setting button: Short press this button to set the alarm value of "CO2→TVOC→HCHO" in turn, display the original factory setting value and flash. Use + button and - button to adjust parameters, value will be automatically stored after 10 seconds.

Five. Display Content Introduction:
1. Alarm sound: press 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 temperature unit selection button to operate.
Measuring range:
0℃~90.0℃ (Precision 0.1℃);
32℉~194℉(Precision 0.1℉, above 100℉display integers).
6. Environmental quality reminder:
Excellent:
* Detection value is lower than the set value.
Good:
* CO2 detection value is 50ppm higher than the set value;
* TVOC detection value is 0.01 mg/m³ higher than the set value;
* HCHO detection value is 0.03 mg/m³ higher than the set value.
Pollution:
* Buzzer quickly sounds alarm.
* CO2 detection value is 100ppm higher than the set value;
* TVOC detection value is 0.02 mg/m³ higher than the set value;
* HCHO detection value is 0.06 mg/m³ higher than the set value.
7. When battery power is too low, battery frame will flash to remind users to charge.
When charging, characters in the battery frame will flash sequentially until the battery symbol is fully displayed when the battery is fully charged.
8. Humidity display: Measuring range: (0~99.0) %RH (Precision 0.1)

Six. Power Supply:
* Built-in 3.7V lithium battery.
* Please use a standard safe charger to charge.

Package Included:
- 1 x Set of Air Quality Meter