Review on bayite Mini Digital Current Voltage Amp Meter: Accurate & High-Precision Gauge with Hall Effect Sensor Transformer (5-120V, 100A) by Malik Axmed

I installed these meters (4 pieces) in the boat's electrical system to measure volts (approx. 12 volts DC) and amps (up to +/- - 150A) in charging and power circuits (multiple batteries and charging systems). I used three 0-100A meters and one 0-400A meter. Unfortunately 0-100A meters will show 3 digits with one decimal place (claimed accuracy of +/- 0.2A) but 0-400A meters will only show 2 digits (unless the current exceeds 100A ) without decimals, so the accuracy is +/- 0.2 A. - 1A. I could live with accuracy, but four meters together looks a bit odd aesthetically; but that's just a cosmetic problem. During operation, the gauges always draw a small amount of current from the supply, so I routed all the neutral wires through a simple switch so I could turn them all off and avoid constant drain on the boat's batteries. . A more serious problem was the location of the selector switch, which was hidden on the back of the meter and out of reach when the meter was panel mounted. I solved this problem by paralleling a switch for each meter and installing new switches on the surface in an accessible location. Calibration is easy, but once installed, the only realistic method of calibration is to ensure that there is no current in the cable being measured. This means that the meter's power cable must bypass the hall sensor. You must take this into account in your base scheme. Negative voltages are not displayed with a negative sign, but with an additional illuminated "second decimal point" at the end of the display. I would prefer a negative sign, but once you get used to it you'll be fine. The meter comes with an extended hall sensor cable which I think is necessary for the installation. The voltage tails are short, but a plant-specific extension was not difficult and would have been necessary anyway. was previously hidden. When working in marine environment, I tried to place the measurement panel in a well sheltered (dry and shady) place; important given the nature of the display and the need to protect the electronics. Of course the gauges have just been installed so I can't comment on long-term reliability, but so far so good.