Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time

After, having another options, this Became the most important tool for my electrical projects .Reliable, Consistence … just one down side, is turns off, a little faster than, for me Coming and Going (in a Second Floor) working alone !And, Having- have been Made , outside of the States .

I used this to test all of my house outlets. I found one that had reversed wiring, so it was definitely worth it. I was also able to independently test the GFCI outlet functions, and not just rely on the test buttons built into those outlets. I don't have any AFCI outlets so I can't try that test function.Tester is easy to handle and small enough to reach most outlets. Cord length is short but acceptable given the function of this tester. An extension cord may be needed for reaching outlets where there is not enough space to fit the tester, or where the tester display needs to be located far from the outlet for easier viewing of the status lights.The build quality is good. The tester display just has simple lights but they are easy to see and understand.The main downside is that the tester turns itself off too quickly. This frequently happened right when I plug it into an outlet. According to the instructions, the tester shouldn't be turned on while it is plugged into an outlet, so it's a little annoying and a slight waste of time every time it turns off to pull it back out, turn it on, and then push it back into an outlet. It would be great if there was a way to adjust the amount of time it can be idle before it turns itself off.

The good: It is the only tester available in the US at the time of my writing this that can test every AFCI receptacle and breaker. Some testers on Youtube reported that it fails to trip the "purple" Homeline dual-function GFCI/AFCI breakers on shorter cable runs (really puzzing there), but I didn't encounter that.Tests everything reliably, including voltage drop.A couple of irritations:The female end of the "pigtail" plug tends to slide out of the device, sometimes ever so slightly, looking like it's plugged in, but it's not. This can create a dangerous sense of security making you think that receptacle is not powered. Also, it has a "hold" function that keeps showing the voltage for about 10 seconds after the receptacle lost power or the device was unplugged from the receptacle. It can be useful, but there should be a way to turn it off. I couldn't find how.

Excellent product. Get used quite often.