The readout displays isometric grip force from 0–200 lbs (90 kg). The unit's easy-to-read LCD display can be set to display pounds or kilograms. Jamar Plus+ also features Rapid Exchange Testing with audible signals, and automatically calculates the Average, Standard Deviation and Coefficient of Variation. Allows collection of up to five trials for both right and left hand. Ten minute auto-off feature helps conserve battery power. Requires two AAA batteries (included). Comes in a reusable storage container. One year warranty.