The WST 200 tester ensures that basic ESD protection is met by quickly and accurately measuring the resistance of the wrist strap system and signally a pass or fail. with a test voltage of 9 volts DC, the unit is specially designed to test without harm to the operator. The WST 200 verifies that a continuous grounding path between a wrist band and coil cord by indicating three levels of resistance: "HI", "LO" and "OK" with an easy to read LED light and an audible alarm. Test parameters are factory set to pass 800K-10M.