This Baseline Caliper Calibration Block is used to ensure the accuracy of the readings from both the Skinfold Caliper and the Skinfold Caliper Deluxe. A caliper is used to measure the thickness of skinfolds which is then translated to body fat content as a percentage of body weight. Please note, this is the calibration block only. The Caliper is available separately. Ensures accuracy of measurements from 10mm Ã¢ÂÂ 50mm. "Floating tips" on the Caliper assure accurate and reproducible results. The Caliper is quick and simple to use. Just take three measurements at each skinfold site and average these readings. That number is the final thickness. At 3" long and weighing less than a pound, the calibration block can be stored in the Caliper carrying case. Baseline Products are a trusted name in measurement and evaluation instruments. Their products have been used by Medical Professionals, Therapists, Doctors and Rehab Clinics all over the world since 1974. This Calibration Block is a Baseline product, which means it's a trusted name in measurement and evaluation instruments. Baseline products have been used by Medical Professionals, Therapists, Doctors and Rehab Clinics all over the world since 1974. If you have ever received therapy after an injury, you have probably had your progress tested and measured with a Baseline measurement instrument.