Description: [Detect Common Wiring Faults] Just plug it in to easily detect outlet wiring problems fast according to the indicator light. Our outlet tester is a good helper for home socket safety. [For GFCI] With GFCI detection button, allows for the check of trip function for GFCI. [For Grounding Products] Our socket tester can accurately detect whether the socket is grounded before using grounding products. [Compact Size] Easy to carry and use. Designed for use with 110V-120V AC at 50/60Hz in 3 wire outlets. Specification: Circuit Testers with For GFCI Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Voltage: AC110V-120V Colour: Yellow Model: HT 305B (with light and switch) Qty: 2Pcs Package Contents: 2Pcs Plug Testers Easily detect: Simply plug the Tester into a live 3-wire outlet and read the lighted neon lamps PROPERLY WIRED - Both Yellow Lamps are Lighted OPEN GROUND - Center Yellow Lamp is Lighted OPEN NEUTRAL - Far Right Yellow Lamp is Lighted OPEN HOT - No Lamps are Lighted HOT/GROUND REVERSED - Red and Far Right Yellow Lamps are Lighted HOT/NEUTRAL REVERSED - Red and Center Yellow Lamps are Lighted Neon Lamp Codes are conveniently labeled in reverse on the back of the Tester To Test For GFCI function Depress Red Button - For GFCI should trip - Remember to RESET For GFCI Note: Due to different batches, please allow the text labeling of the product to be inconsistent with the image. 1. Please allow 0.5-1cm differences due to manual measurement. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures.