HTI HT-1805 multi gas detector(4 in 1)

Features ● HT-1805 detects concentration of O2, CO, H2S and LEL(inflammable gas) ● Light alarm function, more intuitive to the user to recognize the danger by the light warning ● Vibration and buzzing alarm function, the user can obtain the alarm signal effectively and timely to keep away from danger ● TWA(Time Weighted Average): Within the limit, poisonous gas will not produce harmful influence on workers who are exposed to it every day ● STEL(Short Term Exposure Limit): With time weight of 15 minutes, calculate the average value by measuring many times in 15mins ● High concentration, Low concentration, TWA ＆ STEL alarm setting, the user can freely set the values ● Back-light design, you can hold down the "ENT" key to switch on/off back light ● Liquid crystal display screen, anti-reflective and anti-dazzling, provides an excellent viewing experience  Specification  ● Size: Approx. 135mm x65mm x43mm/5.31x2.56x1.69" ● Detection: O2, CO, H2S ＆ LEL(inflammable gas) ● Power supply