Stop Shock II circuit analyzer. Tests GFCI (ground fault circuit interrupter) receptacles and determines appropriate wiring needed. Uses advanced circuitry and patent pending design to detect required low resistance on ground wire. Easy to understand LED (light emitting diode) readout for correct wiring or Bad Ground Open Neutral Hot/GND Reverse Hot/NEU Reverse and Open Hot wiring errors. Features high impact ABS housing with a 250 Lb. crush rating and withstands drops of up to 10 Ft. Features 360 degree LED indicator light and advanced ground testing circuitry. Limited lifetime warranty. WARNING: This product can expose you to chemicals including DEHP which is known to the state of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov -