This device simply shows you whether you have connected the Gfci correctly using the displays. You can then fix your wiring so that it is correct. Problems with the GFCI cabling identified very quickly. Belongs in every craftsman's toolbox.
VIVREAL 4 In 1 Stud Finder Wall Scanner With LCD Display - Center Finding Beam Finder And Sound Warning For Wood, AC Wire, And Metal Studs (Black/Silver)
24 Review
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white
25 Review
Thermometer B.Well WF-4000 white
57 Review
Xiaomi iHealth Meter Thermometer White
24 Review
Kapro 307-08-TMS Try And Mitre Layout And Marking Square With Stainless Steel Blade, 8-Inch Length
18 Review
Kapro - 353 Professional Ledge-It Try & Mitre Square - For Leveling And Measuring - Features Stainless Steel Blade, Retractable Ledge, And Etched Ruler Markings - 12 Inch
23 Review
π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
3 Review
TV bracket Kromax DIX-18 black
52 Review