Hydrogen sulfide detector T40 T40 single-gas detector compact and lightweight, can easily do in the belt, shirt pocket or helmet. 4-digit, 7-byte large LCD display can clearly read out the gas concentration, type, peak and high and low concentration alarm levels. If the measured gas concentration exceeds the preset safety value, the instrument will automatically sound, light and vibration alarm to alert the user. Peak Memory function can capture and record since the first boot from the monitor to the maximum reading. Unique and simple flip to complete the calibration. This design has applied for a U.S. patent. Specifications ★ Shell: impact composite materials, anti-radio frequency interference (RFI) ★ Size: 58mm (length) x 19mm (W) x 86mm (height) ★ Weight: 0.098 kg ★ Sensor: electrochemical principles ★ Alarm Indication: High frequency beep, high light alarm, vibration alarm ★ Range :0-100ppm, Resolution: 1 ppm ★ Power: You can replace a AA / 5 AA Duracell (MN1500) ★ Running time: alkaline batteries (approximately 500 hours) ★ Alarm point: 10 ppm / 20 ppm ★ Temperature range: -20 - +50 ℃ ★ Humidity range: 15% - 95% RH (non-condensing) ★ China Certification: Metering: JJG915-96, JJG695-90 measurement equipment manufacturing license Buy: Built 01,150,210 explosion: GB3836.1-2000, GB3836.4-2000 Ex mark: Ex ia I, Certificate No.: GYB02585 coal safety: MT703-1997, Certificate No.: 20031923 ★ International Approvals: UL and cUL - Class I, Groups A, B, C, D CENELEC (ATEX) and Australia:-EEx ia IIC T4