A skin fold calliper is a device which measures the thickness of a fold of skin with its underlying layer of fat. By doing this at key locations on the body it is possible to estimate the total percentage body fat of a person.Skin fold callipers have springs which exert a set pressure on the skin fold, generally 10g/mm², and an accurate scale which measures the thickness in millimetres.Instruction booklet included.Calibrated jaw measures up to 80mm.Measurements read to the nearest 0.5 mm.Easy to use pistol grip trigger.Dual springs for consistent measurements.Comes with an informative 22-page instruction manual.Made of durable ABS plastic.Weight: 200g.Dimensions: 280mm x 250mm