Desco 19240 Pass/Fail Wrist Strap Tester, 9 VDC Portable small package; supervisor can use to spot check users on shop floor For use with single wire wrist straps per ESD TR53 Battery powered 9 V tester, no adapter needed Test results include fail low, pass, and fail high; if wrist strap fails, the operator will know if the failure is too high or too low Test can be performed during normal use at the workstation: Improved productivity, workers can test without having to leave the workstation