Digital Hand Dynamometer:

The 300 lb. digital hand dynamometer uses the same hydraulic system but has the added advantage of an easy-to-read LCD display. Features an electronic zero calibration system, a power management system that assures as least 1000 hours of use without changing the 2 "AAA" batteries, a low battery life, and an automatic shut off. Push button console includes a button to zero the last maximum reading stored in memory, a maximum button to display the highest reading since the last press of the maximum clear button, and a lb./ kg. toggle button to change the measurement reading.