Jamar Hydraulic Hand Dynamometer is ideal for routine screening of grip strength and initial and ongoing evaluation of clients with hand trauma and dysfunction. Virtually leak-proof hydraulics and isometric design ensure accurate, reproducible results and years of reliable service. Jamar Hand Dynamometer is built to last, a shock-resistant rubber cap protects the stainless-steel guage and a wrist strap prevents accidental damage if dropped. Jamar Hand Dynamometer has dual-scale readout displays isometric grip force from 0 - 200 lbs. Peak-hold needle automatically retains the highest reading until reset. Jamar Hand Dynamometer's handle easily adjusts to five grip positions, from 1 3/8" - 3 3/8", in half-inch increments. Unit comes with a carrying/storage case and complete instructions.