100A RC Watt Meter High Precision Power Analyzer Digital LCD Screen Amp Meter for Voltage(V) Current(A) Power(W) Charge(Ah) and Energy(Wh) Measurement

Horrific! Voltage reading off by at least 22%. Current measurement is not even in the same universe. Current displayed 6.3 Amps on a verified 1.4 Amp load. Do not waste your time and money on this meter!

Seems to work good, probably just like any digital sampling of current maybe 10% deviation from other inline meters in my installation. Very readable display with different summaries available at the push of a button. Sooooo many bad reviews of the blue one get this black on taupe liquid crystal one.

The included data sheet (11/2022) mentions connecting an auxiliary battery to the 3-pin connector when the battery source being monitored is less than 4.8 volts. This is because the device itself normally uses the battery being monitored as its own power source. But the device needs at least 4.8 volts to operate. However, the diagrams only show a 2 wire connection without indicating which of the 2 pins on the 3 pin connector to use. It also shows to connect positive auxiliary battery to the top most pin. However, the video in the product descriptions clearly shows the black (negative) wire connecting to the upper most pin and the red (positive) auxiliary battery wire connecting below it which is the middle pin of the 3. I tested applying an auxiliary battery with positive to the middle pin and negative to the top most pin and it worked. The similar device ASIN B0B8VWNY9X has photos with labeled PIN numbers and functions that agree with the above. The resistor that senses the current is inline with the negative return ground lead not inline with the outgoing positive lead. The positive input lead is hardwired directly to the output lead on the circuit board. Not a problem unless your load gets its ground connection somewhere other than directly back to this device’s ground lead. For example, in an auto application if the load is grounded to the vehicle chassis. Circuit board is well made and clean.

I was hoping this meter could read lower amperage draws on indoor RC aircraft. Seems to lose the amperage just below 1.8 amps on a 2S lipoly pack. The amperage jumps almost to 5 times the actual draw once below 1.8 amps. The voltage is also off by about 0.17 volts too low

Lasted 3 months and then quit

Very easy to read, well constructed, backlit on/off control, reset totals without disconnecting, selectable totals instead of the numbers cycling automatically making it easy to read. However the voltage being low by 2.2% may sound fairly accurate but when I measure 12.96 volts on a battery which is really 13.24 it means a big SOC difference for a LiFePo4 battery bank. It should be fairly easy to have a calibration trim pot to adjust like in some $3 meters I have making it very accurate but they don't. With the amps low at the same time the resulting watt hours will be even further in error.

this product is just More China Garbage .....hooked it up and it failed right away Amazon sells more Chinese products that are a waste of time and just garbage that fails or is not what it says it is before you spend your money on it.. why do the allow China to sell on their platform ..waste my time my gas to drop it off at a return store ..this happens frequently ill be looking else ware for my needs Amazon has become a arm of chinas economy profit and selling subpar items from them

This is a robust and capable widget, but they really need to double the length of the attached wires.