Jamar Digital Hand Dynamometers work to provide enhanced medical screenings that are easy for doctors and their patients. They run on AAA batteries and have a ten minute automatic shut-off for energy efficiency. The hand dynamometer has clear audible signals for aid in testing, calculates the Average, Standard Deviation, and Coefficient of Variation, and clearly displays results in both pounds and kilograms. Use to measure your patient’s grip strength and track their progress during therapy. For protection and travel, the Jamar Hand Dynamometers come in a reusable storage case.