multigas detector H2S Co 02 lel bosean bh-4a bh4a

Specification： Gas type: Oxygen/carbon monoxide/hydrothion/combustible gas( O2/CO/H2S/LEL) Gas measurement range: O2: 0~30%vol, CO: 0~999umo/mol(ppm), H2S:0~100 umo/mol(ppm), EX (combustible ):0~100%LEL Resolution:0.1%vol/1umo/mol(ppm)/1% LELLow/High alarm/Alarm setting: Yes 4 Alarm methods : Sound Alarm, Light flashing, Vibrating alert, Screen shows, adjustable alarm values, alarm sound up to 80db Operating temperature:  -20℃～50℃(except LEL is 0~40C) Operating humidity:＜95%RH (no dew) Display: 2.4 inch HD display Power: 3.7V li-battery(Built-in) Battery runtime: 6-8 hours or so. Product Net Weight : 400g (with battery) Size : 145mm×69mm×28mm (L × W × H) Packing List: 1 x 4 in 1 mutil gas monitor 1 x English User manual 1 x Charging adaptor 1 x USB charging cable 1 x Calibration cover 1 x Metal aluminum box 1 xCertificate