Description Accurately measure skin fold thickness utilizing one to calculate bodyfat levels using measurements from front of upper arm, back of upper arm, waist and upper back. The included instruction manual provides male and female charts including frame size, bodyfat calculations for 1, 2 or 4 test locations and height/weight, along with information on how to determine muscle loss or gain, how to determine frame size and how to find a persons weight for a desired bodyfat level. Features: Calibrated jaw width can measure up to 80mm Easy to use pistol grip trigger Dual springs for consistent measurements Made of durable, ABS plastic material Quick, accurate results in 3 easy steps Specifications: Size:27.5x24.5x1.5cm Measurement range: 0 to 80mm