Using the Greenlee GT - 10GFI is easy. First, make sure the device is turned off before plugging it into a 120 V AC grounded outlet or a GFCI receptacle. Then, turn it on and watch the light sequence. If the lights show the pattern indicating correct wiring, you're good to go. If not, there may be an issue with the wiring that needs fixing. When using this tester, always wear appropriate safety gear like insulated gloves. Keep it away from water and high - humidity areas. For maintenance, store it in a dry place at room temperature. Wipe it clean with a dry cloth after each use. If you notice any damage, don't use it and contact the manufacturer for repair or replacement.
