Equipped with an infrared remote control, with a reception range of up to 8 meters: In explosion-proof areas, there is no need to open the cover to set parameters, thus preventing potential dangers caused by static electricity friction when opening the cover. The operation is safe and reliable. Multi-layer protection and full software calibration: It features overvoltage protection, protection, short circuit protection, reverse connection protection, anti-static interference protection, anti-magnetic interference protection, and has an automatic recovery function to prevent damage to the instrument. Full software calibration, with up to 3-level target point calibration function for sensors, ensures the accuracy and linearity of the measurement. Five concentration units for both Chinese and English: Simple and practical. A total of four standard keys are set for on-site operation. PPM, %VOL, mg/m3, umol/mol, 10- can be switched freely. Output multiple signals. Transmission distance of 1 kilometer: The body shell material is cast aluminum, which is explosion-proof, corrosion-resistant, and has an IP65 protection level., Manufacturer: VXDEFP