Poorly made... mine had a defective LCD display right out of the package.Bad design - because of the way they shaped the device, it will cover BOTH of the outlets in a standard wall socket. Had they moved the plug part on the back an EIGHTH of an inch lower, it would have been fine, leaving the other outlet free. Incredibly frustrating... want to measure one device when there's two things plugged into an outlet? Sorry, you're out of luck... you have to move other devices to other outlets in your room which can be really inconvenient, if not impossible.And as others have pointed out, it's virtually impossible to read the UNLIT display... and it goes blank when you pull it out of the wall since they didn't include a battery backup.All-in-all, a very frustrating product not worth the money.