I did a quick and dirty review and teardown of these cheap digital AC panel meters that read voltage and current.
Pros:-
Bright clear display
Cheap (about US$3.60)
Easy to mount
Can sense up to 100A (and up to 500V)
Cons:-
Doesn't show currents less than about 750mA
Current readings seem to be be low/inaccurate
Voltage readings are also a little hit and miss, only accurate to within about 2-3%.
I'm thinking that it may be possible to add a trimpot to calibrate the current measurement. (But I need to get something to accurately compare it against)
