LEL range 0-100 percent LEL or 0-5 percent CH4;

O2 range 0-30 percent Vol;

CO range 0-500/2000ppm;

H2S range: 0-100/500ppm;

1. Four in one is a personal protective equipment, and the internal sensor range of the instrument is limited. If the measured gas exceeds the range, it is not easy to measure for a long time, otherwise it is highly likely to cause sensor damage.

2. When toxic, harmful, and combustible gases are detected, detailed values will also be displayed after displaying the words "high" or "low". Please read the detailed values. (LOW: low alert, HI: high alert)

3. Portable four in one can receive electromagnetic wave disturbance, and when there is electromagnetic wave disturbance, the measurement value may be inaccurate. When there is electromagnetic wave disturbance, the four in one alarm will be activated, and the electromagnetic wave disturbance will be eliminated before measurement.

4. When using four in one, it is important to pay attention to the battery level and replace it in a timely manner when it is insufficient. Please do not charge the instrument at the testing site to avoid sparks caused by unplugging and plugging the charger, which can cause fire or explosion.

5. Charge in a safe area, replace and charge in a timely manner.