Review on Klein Tools RT210 Outlet Tester: Detect Common Wiring Problems in GFCI / Standard North American AC Outlets by Luis Baker

This product does not provide reliable testing, especially outdoors. It uses neon light bulbs that draw almost no current. I just tested an outlet that I knew had an open ground and the tester showed good ground. But when I test with a hot bottom 15 watt bulb, nothing. It's an electrical engineering snag that we all know that in order to reliably test a circuit, you have to have some load on it. This tester doesn't stress the circuit and can show you have a good ground if it's missing. I'm surprised because Klein has such a high reputation in the power tool industry, but whoever makes this tester for them is making a dangerously defective product.