Tthese are rated for ac as well as DC so they do have some smoothing. I ordered a small hour meter from china... ~7bux, will be connecting it to the 12v psu and calling it a day. I want to know the operating total time, no matter if idle or working. I ordered a 6 segment unit with a 1 segment giving 10ths, That is good enough to measure close to 12 years of continuous use.
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Modicum V1 sold on e-bay user jaguarking11