1. Monitor the real time connection and disconnection of ESD table mat to ground 2. Monitor the real time connection and disconnection of wrist strap to ground, under the guaranteeof double to ground, the path integrity of ESD to ground is more ensured 3. Monitor has the anti-stupidity function, red LED will flash and comes with audible alarm after power monitor on, plug wrist strap and connect proper ground, green LED will illuminate 4. Plug wrist strap into monitor socket, monitor will alarm when wear wrist strap abnormally 5. Monitor will alarm when wrist strap is in open circuit or poor contact 6. Monitor 2 single wrist straps and 1 table mat simultaneously 7. Accuracy 8. When monitor alarm, red LED light flashes and also comes with buzzer sounds 9. Suitable for any kind of single wrist strap 10. Beautiful appearance, strong anti-interference ability