Features: 100% continuous monitoring Works with standard one conductor wrist straps/cords New technology -capacitance/impedance hyper technology NIST calibration included with certificate Visual LED, audio piezo sound AC powered or 6 volt battery operated Off/On switch Set points can be adjusted for impedance of wrist straps, capacitance of person and resistance of mats Works extremely well with Ultimat ESD Rubber Specifications: Safe limits: 0.75-1.2 ohms. Can be adjusted according to weight and size of operator. Fail limits: Below. 75 megohms and over 1.3 megohms. Visual alarm: Red-fail, pass-green. Audio alarm: Piezo buzzer. Operation: - active when switch tuned on. - Inactive when power switch turned off, cord on docking snap, wrist strap on and green piezo on. - Wrist straps connected to ground even if monitor turned off. - Trigger impedance not changed by change of incoming voltage. Power: 110 volts or 6volts battery with low power LED. Socket: Banana plug.