PureAire Monitoring Systems Air Check Oxygen Monitor, Accuracy: +/-1% of Full Scale, Depth: 3.25 in., 82.5 mm, Enclosure Material: Polycarbonate, Temperature Operating: -40 deg.C to +55 deg.C, Weight: 1.6 lb., 0.8 kg, Width: 6.5 in., 165.1 mm, Analog Outp