Data storage, printing, temperature and humidity measurement can simultaneously detect 1 to 5 kinds of gases and high temperature flue gas. High-definition display screen, simulation icon display menu function, built-in pumping measurement. The MS500 hand-held five-in-one gas detection instrument has a protection level of IP66, can prevent rain and water splash, and is equipped with replaceable water vapor and dust filters. The battery capacity is 5500 mA, overcharge, over-discharge, overvoltage, short circuit and overheat protection, 5-level accurate power display, USB communication and charging interface, RS232, infrared communication automatic detection and identification, compatible data information export, real-time update curve and history curve display. Multi-unit free conversion, zero point automatic tracking, multi-level concentration calibration, intelligent identification and blocking of calibration misoperation, audible and visual alarm, vibration alarm, undervoltage and fault alarm, one-button recovery function. M500 hand-held five-in-one gas detection instrument is waterproof, dustproof, explosion-proof, shockproof, intrinsically safe circuit design, anti-static, anti-electromagnetic interference.