After reading a few negative comments on these guages, I decided to watch ours closely over several months (purchased from Sam's Club). Put one on the grill, it has gone down very accurately IMO. FWIW, I frequently forgot to turn the bottle off after BBQing and have never experienced any loss of
propane. So now I just leave bottle on all the time (after once giving it the old soapsuds test at the connections.)
Purchase again? You bet! It's a good tool to have!
Having said all that, with the automatic changeover device already on the dual trailer bottles, we have never run out of
propane while traveling.