IST RS-220 Heat Stress Monitor, Wet Bulb Thermometer. Government surplus, includes interesting "U.S. Property" fiberglass case. Unit appears to be functional, but it is out of its calibration date. Manual and additional paperwork included. Also includes bulb, tweezers, carrying strap, and power cord. Tested as shown on internal battery power.
Case measures approximately 13"x11"x6" and has Southco latches.
