Portable Multi Gas Detector Model: GasAlert Max XT II Brand: BW Technologies by Honeywell Gas Sensors: H2S/CO/O2/LEL Origin: Mexico/Canada Specifications:  Continuous LCD shows real time gasconcentration.  Sensor: Range: Resolution Hydrogen Sulfide: 0 – 200 PPM: 1/0.1 PPM.Carbon Monoxide: 0 – 1,000 PPM: 1 PPM. Oxygen: 0 -30% Vol.: 0.1% Vol. LEL: 0 -100% LEL: 1% LEL.  Operating Temperature: -20 to 50°C.  Humidity: 10 – 100% Rh.  Pump Draw: Sample from up to 75ft.  Battery Life: 13 hr. Recharges in 6 hr.  Simple automatic calibration procedure.  Water-resistant.  Alarms: Visual, vibrating, audible (95 dB); Low, High, TWA,STEL, OL (over limit), Low Battery, Pump.  Approvals: UL, IECEx, ATEX & INMETRO.