The Saehan Hydraulic Hand Dynamometer Grip Strength Tester utilizes a durable hydraulic design. Designed to provide years of dependable service with minimal maintenance. Features dual scale readout measuring up to 200 lbs. Peak/hold needle stays at the highest reading until reset. Isometric measurement is accurate for repeatable results within 2%. To accommodate various hand sizes, the handle adjusts to five grip positions from 1 3/8" to 3 5/8". Use of the wrist strap helps prevent accidental dropping. Includes a hard shell case. Limited two year warranty