Jamar Hydraulic Hand Dynamometer, Max Force Patient Progress Indicator to Measure Grip Strength, Calibrated Strengthener Measures PSI, Cordless Hand Trauma Evaluation Tool, Easy Squeeze, Adjustable Measures isometric grip force and strength increases in rehabilitation and physical therapy programs Ideal for routine screening of grip strength and initial and ongoing evaluation of hand trauma and dysfunction Adjustable handle allows user to quantify grip strength for different sized objects, accommodates small and large hands, with five grip positions from 1.375" to 3.375" Dual scale readout measures isometric grip force in both pounds and kilograms, up to 200 lbs. or 90 kgs., with a peak hold needle that retains highest reading until reset Unit comes with carrying/storage case, certificate of calibration, one year warranty, and complete instructions for hand strength and flexibility screening