... diffusion (which can increase pump into the pump suction)2, LCD digital display3, sound, light, vibration alarm at the same4 DC3 ... )6 easy touch buttons7, highlight the Backlight8, precision: ≤ ± 5%1. Detection of gas: flammable gas2, detection principle: Electrochemical methods3, detection ... -type (can be added into the pump suction pump)6, Display: LCD display7, alarm error: ≤ ± 5% (F.S)8, Alarm mode: ...