Agreed here - if your \FAT via the eyeballing method, the client already knows it and doenst need conformation via calipers that they have 40kg of excess fat…
Once under around 20% fat, then one could move to calipers. Above that, Bioemp. will work fine, or even just Tape a range of areas.
Im not sure how accurate Bio. is once your under around 15%, the one i got is crap under 15% - but its a bit Dated in age now. New ones might be good?