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The problem with cheapo callipers is they're on all the time (even when "off") in order to keep track of their position, so the battery is always dead.
Do you mean the cheaper ones cannot be manually turned off when they are not being used, or just that they don't auto power down when left idle for a while?
Nick_S
@grams
The problem with cheapo callipers is they're on all the time (even when "off") in order to keep track of their position, so the battery is always dead. Genuine Mitutoyos* have a more complicated sensor track that allows them to actually power down.
(* there are lots of shameless fakes)