The grip strength device of the hand dynamometer can store up to 19 user-definable data This popular handheld strength gauge is charged via USB, which is more, and can be used Standard 2xAAA batteries ( not included) can also be used Just turn on the hand force gauge and press start to measure immediately, and press the manual dynamometer with the force for at least 5 seconds After testing, the LCD display automatically displays the value of the grip force, of the grip force is displayed in strong, normal or weak This handheld strength gauge is equipped with a high-precisions strain gauge sensor, which allows you to have an accurate, digital reading of grip force Measuring capacity: 0 to 396lb / 180kg The large LCD display clearly displays all measurements on the same screen Readings displayed include user code, ages, gender, grip value in pounds or kilograms, and grip And the newly bright screen function, Manufacturer: Tsophreniq