I ordered 2 pieces and both came in good condition. Instructions are clear and understandable. If you are looking at the sensors from behind, basically install the clamp ring of the transformer in these 2 clamps at the top, the order doesn't matter. The bottom 2 connectors are used to power the device using a standard two-wire plug. The bottom of the two plugs is for the plug's neutral wire, which remains on the plug when plugged into a wall outlet. To the right or 2nd from the bottom terminal, connect the power cord from the plug cord, which is the correct cord when you look at how it connects to the AC outlet. The measuring devices give good readings for power, current, amperes and frequency. I installed one pair on the standby generator, and to take readings from both branches of output power, I installed one for each branch coming out of the generator (both power branches). The counters are of good quality and excellent value for money. I would recommend them and buy more for future use.
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