TL; DR: Both are easy to use, have good features, are quite small and seem like very accurate options) Cons: no prediction mode works Cons: no power wattmeter Comparison of two power monitors that have features that others don't I'll talk only about the ones I consider relevant. PN has a really basic interface like the P3, but with the backlight on and off, I have to vote for PN on the interfaces. Finally, the only other real difference would be the measurements. In short, the P3 has very few modes, it's a bit bigger, more expensive and looks a bit dated, but a really good prediction mode. If you are mainly interested in the cost of your device and overall l the amount consumed per (month/year/day/etc.) without having to do any mathematical operations other than looking at the screen, this is the device for you. In short, PN is smaller, looks more modern and has many more features. With a backlight and metering mode for just about any energy monitoring you need, this is what you need. If prediction mode was added to PN, FARRR would be the #1 winner. I'm leaving it 4 stars only for the lack of that mode.
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