Utilizing a durable hydraulic design,ideal for evaluating grip strength. Designed to provide years of dependable service with minimal maintenance.The Dynatron Hand Dynamometer features dual scale readout measuring up to 200 lbs./90 kg. Peak/hold needle stays at the highest reading until reset. Isometric measurement is accurate for repeatable results within 2%. Easily adjusts to five different positions from 1.375 in - 3.625 in . Use of the wrist strap helps prevent accidental dropping. Available in either a soft or hard case.