The Orion Multi-gas Detector is a low-cost, reliable, and easy-to-use portable instrument for detecting the presence of O2, H2S, CO and combustible gas.  It will stand up to the roughest handling in the toughest environments.  Features include:

One Button Calibration

Long-Life Battery

Carbon-filled Nylon Case

Large, Easy-to-read Display

Durable Sensors

Link Software