I used some combination digital meters I got off Amazon just for current and they work great. The voltage just says 120 but I'm using them on bricks so the voltage is fixed anyway. They only read down to 40 volts ac and had to have at least that to operate so I just ran 120 to them for power. That was the best I could find for a reasonable price. I considered using a cheap multimeter for voltage with just the display showing through the panel but decided that wasn't worth the hassle. The meters use a small current transductor to detect current..
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