all the electrathon guys had two of them in the cockpit, V&A(but the A scale was the voltage reading on a shunt), every one of them was the harbor freight special. but i bet they don't blow them up as fast as me.
i found that the plugs on the cheapos came loose because they put an extra length of shielding around the end of the plug that goes into the jack built into the pcb ( i presume the extra sleeve is there to prevent accidental electrocution if someone held the opossite end while inserting it into high voltage). i had one that the probe leads would always fall out of because when you pushed the plug into the jack, the jack mounted on the surface of the pcb flexed away to the inside of the case so it did not seat all the way.
to solve that i cut the plastic shield off the plug back up to the main part of the plastic casting to stop the interference from the outer plastic cover, and then i took a piece of a plastic straw from a dutch bros coffee that bill had left behind one day and used it to support the pcb from underneath. i had saved the straw for some unknown reason in my special recycling pile, but i am a reuse to the max kinda guy.
anyway i cut the straw to length and put it inside the case directly under the jack where the lead plugs in so the pcb could not deform and bend away from the incoming jack tip pushing into the spring clip of the plug. the plastic straw was non conductive, went from flakey to total solid reliability, never popped out again.
these little meters will not carry the kinda current that the hubmotors require since they are limited to 10A so you need to use a shunt to measure current, like the electrathon guys do. but that is easy, and overall is still a cheap hack if you can get them on the $3 special.
