... level:IP65 The weight:200g Accuracy:±3%F.S. Detecting way:Ciffusion Type or Pump suction method Concentration unit:ppm ... ,%VOL,%LEL,mg/m3 Acousto-optic alarm means:, vibration Working temperature: - 40 ~ 70 °C Work humidity: ... into normal measurement interface, Lower gas species, right now display vibration motor and buzzer, indicator. All alarm 1 times says the normal ...