Full featured gas monitor provides continuous digital display of a specific toxic gas concentration, STEL, TWA and Peak values along with high, low, TWA and STEL alarms. ToxiRAE II does not have a pre-programmed expiration date, so you get the full life out of the battery and sensor both of which are easily replaced in the field. Include with order is: monitor with sensor as specified, operation and maintenance manual, rugged stainless steel alligator clip (installed), stainless steel belt clip/hardhat adapter, wrist strap, calibration gas test adapter and high-capacity Lith-ion battery.