How about right here at IM? The calipers themselves aren't 3 point or 7 point. That is simply the method used to calculate BF. 3 locations or 7. The Accu-Measure (especially the non-digital ones) are inexpensive and accurate.
There should have been a booklet showing the measurement sites and a chart to interpret BF%. If you don't have it, I would contact Accu-Measure and see if they will send or even email you a copy.
I have an Excel spreadsheet I can send you for the 7 point...just PM me. It's got all the formulas already in place so you just have to put the numbers in.
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