u shouldn't have too much problem find a pair of cheap plastic callipars ... if you are a gym member, then you can usually get this done for free ... other than those scales that do some kind of test based on eletrodes ... i'm out of ideas
Try finding someone with an OMRON handheld body comp analyzer. They are about as accurate as calipers, and I don't trust most people with calipers anyway. Too much room for human error. You could get tested by 5 different people and get 5 totally different results! Unless someone is trained and experienced taking skinfold measurements, you can't rely on the outcome.