... the Backlight8, precision: ≤ ± 5%1. Detection of gas: flammable gas2, detection principle: Electrochemical methods3, detection range: 0 ~ 100% LEL,4, ... LCD display7, alarm error: ≤ ± 5% (F.S)8, Alarm mode: sound, light, vibration alarm9, response time: ≤ 40s10, sensor life: ≥ ... 140gApplicable to mining, metallurgy security ring, Chemical Services and other occasions Combustible Gas Detector