... suction)2, LCD digital display3, sound, light, vibration alarm at the same4 DC3.6V ~ 4.5V battery supply voltage5, alarm point can be ... % LEL,4, Resolution: 1ppm5, detection method: diffusion-type (can be added into the pump suction pump)6, Display: LCD display7, alarm error: ≤ ... ± 5% (F.S)8, Alarm mode: sound, light, vibration alarm9, ...