Full-scale temperature digital automatic tracking compensation to ensure measurement accuracy. Adopt advanced microprocessor technology, fast response speed, high measurement accuracy, good stability and repeatability. On-site large-screen multi-parameter LCD display with backlight, intuitive display of gas concentration, type, unit, working status, etc. Independent air chamber, no on-site calibration is required to replace the sensor, and the key parameters of the sensor are automatically identified. The detection site has on-site sound and light alarm function, and the gas concentration exceeds the standard in real time, which is the safety guarantee for dangerous field operations.