The B&L Engineering® Hydraulic Hand Dynamometer is the worldwide clinical and research quality replacement for the Jamar® Hydraulic Hand Dynamometer. Measures grip strength from 0-200 lbs. (0-90.91 kgms) at five handle positions. Official Calibration certificate included with correlation coefficient of .9994 or higher and mean deviation less than 1.5 lbs based on 12 different weights at all five handle positions. Method of Dynamometer Calibration defined by Elaine Ewing Fess, MS, OTR, CHT, FAOTA. Manual with Normative Adult and Child Tables. Includes double-walled rigid plastic case with fitted foam to protect the instrument when not in use. Officially CE Marked. Two-year warranty!