This is a good idea, but the materials are probably poor or assembled incorrectly. I tested it for reverse polarity in both positions. I connected the tester to a NEMA 5-15 to NEMA 1-15 adapter (non-polarized) so I can safely test for polarity reversal. But to my dismay, the red indicator never lit in the reversed and correct position. The red indicator light is completely off. However, the indicator correctly identifies open and correct earth. However. I became suspicious of this tester when I heard a faint ringing in the tester, but I didn't pay attention to it at first. I'm glad I tested it to make sure it's ok. I think I'll just pay a little more for a non-contact voltage detector. But not from the UK. Update: Received a replacement that also didn't recognize the polarity reversal. Do not buy this product, it gives a false sense of security. But a non-contact voltage tester.
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
Cable tester BENETECH GM60
15 Review
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white
25 Review
ICQUANZX LCR-T7 Transistor Tester: Advanced TFT Diode Triode Capacitance LCR ESR Meter
14 Review
Triangle Group TR918 225/45 R18 95V summer
61 Review
Kapro 307-08-TMS Try And Mitre Layout And Marking Square With Stainless Steel Blade, 8-Inch Length
18 Review
β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
8 Review
π Johnson Level and Tool 400EM-S 12-Inch Heavy Duty Metal Combination Square for Professionals, with Inch/Metric Measurements, Silver - 1 Square
8 Review