This monitor plugged right in, I hooked up my Progressive Surge Guard 50 amp #34951 to my stand I have at home, it showed it was fine, my 43ft-5 . to connect the wheel inside. Then I removed the battery cover from the Southwire #40301 monitor and put 3 AA batteries in and it connected perfectly, it shows me how many amps I'm drawing on L1 and L2 of a 50 amp service. This is a very handy device that allows me to check the mains connection and power consumption of the amp right from my RV without having to go outside to look at the surge protector. Excellent unit.
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