I'm very clumsy person so I like to buy tools that are just short of bomb proof. I want a pair of digital calipers. So I was wondering is there an equivalent of ip rating for being drop proof to say a 1 or 2 meters.
Mil-Spec, or US Military Standards is one type I know of. You frequently see cell phones marketed with mil-spec drop tests, etc. Mil-Specs come in all types, so they don't necessarily cover what you were hoping they did.
My main initial test for if a tool is reliable is its online user review rating. People use tools in a variety of situations at different expectation levels. A high user approval rating means that even some of those people that abuse it were happy with the performance. I find this to be a much more reliable metric than any lab preformed tests.
An alternative to taking good care of measurement instruments is to calibrate them often or seek an accuracy 10 times less than the designed accuracy of the device. I have a pair of harbor freight digital calipers that gets all the dirty work and occasionally gets dropped. They hold up well. They measure out 3 decimal places, but just I round to two decimal places and get out the nicer calipers out when I need the additional accuracy.