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Use good quality calipers. The most expensive calipers are generally the most reliable. Monitoring changes in skin-fold measurements, rather than a shake bottle percentage (which is determined through shake bottle a variety of equations) could prove to be a better option. Try shake bottle to take reading within two-four seconds of applying calipers, as a delay could underestimate the skin-fold value. Completely release the spring handles of the caliper when taking measurement so that the full standard pressure of the jaws is applied to the soft tissues (subcutaneous fat) being measured. The best time to test is in the morning, before any form of training or activity. From time to time, take a more advanced test (such as hydrostatic weighing) and compare this to the caliper test results, to ensure these tests are accurate. Look directly at the caliper (not from a side-on angle) to get the bet possible result, and avoid measurement error.
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