BW™ XT II Multi-Gas Detectors - Standard Confined Space Kit, 4 Gas, CO/H2S/LEL/O2Reliably monitors up to four hazards, including H2S, CO, O2 and combustibles Straightforward one button operation Robust motorized SmartSample pump for intelligent remote sampling, ideal for confined spaces Reliable pump block detection; water and other liquids are prevented from being drawn into the pump Calibration is required only two times per year with a simple one button automatic procedure Tamper proof adjustable options can be customized to