Depends on your lifestyle ofc but a cheap 6’ tape measurer keychain has come in clutch more times than I can count. Within the past week I’ve used it to
measure the hatch of my car to see if a box could fit
compared a 14" pizza to a 17" to my friend group to figure what size pizza to buy
measured an entire house worth of soffit
The thing was like $5 and honestly gets more use out of anything in my EDC except maybe my earbuds and even then I barely touch them since graduating from uni