Equipped with high precision strain gauge sensor, measuring capacity 198lbs / 90kgs with devision 0.2lbs / 0.1kgs. Gear adjustable, squeeze the hand dynamometer 5 seconds the LCD will automatically display the value and store it, so that you can compare the result. It can store data for up to 19 definable users. The adjustable handle was suitable for users of different ages, a good fit for students, men, lady or people whose hands need rehabilitation.Need 2xAAA batteries (not include).