Like all Progressive Industries products, this outlet tester is well made and easy to use. I'm a longtime RV driver and have always used a multimeter to check the camp's power socket. This worked well, but setting up the multimeter is a bit tedious, especially in the dark. This tester just plugs in and gives you instant results. It saves time and is easy to use. You can get it in 30 or 50 amp versions. Highly recommended!
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