Digiital callipers are a very useful piece of equipment
I have a very well worn and old set of Mitutoyo digital callipers. They frequently get used.
Was gifted a no name equivelent. I thought they be useful as a spare. In practice the readings of the copy are erratic and the battery
life is short .
Backups of commonly used equipment
is a good idea, but a good name brand is perhaps worth the extra cost.
My experience may have been bad luck. It is only a very small sample size, but a good name brand maybe worth the additional cost. I can guarantee you find plenty of uses for digital callipers on board.