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Meter has displays for Volts AC, PF, Watts, Frequency, kWh used, Current in Amps to the second decimal place.
Watts display auto ranges. It has a settable alarm but all it does is flash the watts display.
I got the 100A version (only $3 more than the 20A version) because I wanted to use it on my remote solar site to monitor stats from the inverter, and the inverter can output 25A, 3X that on a 20 second surge, such as when it is starting an A/C compressor.
I tested it on the space heater in my shop, using the current transformer over the neutral leg as described in the instruction sheet. Worked like a charm. Instructions were a bit vague, but anyone with a little bit of electrical experience should have no trouble.
I usually don't comment on products. But this one cool. Only had trouble giving 5 stars because of the instructions.