Constant Monitor - Single Wire 3 P/N: WSMONITOR3 Constant monitor WSMONITOR3 uses a solid state impedance design to continuously test the connection integrity of the entire ground loop including the person, the wrist band, and the coil cord. It monitors two wrist straps and the bench mat. The system is fully automatic and activates when a wrist strap is plugged into the unit. It provides a green light for safe condition and a red light and tone for unsafe condition. The unit is powered and grounded by the AC adapter.