- High-precision strain gauge sensor measures grip strength up to 396 lb with a graduation of 0.2 lb / 0.1 kg. - Bright screen display and USB charging: newly improved brightness for clear readings in dark environments; charges via USB with an environmentally friendly USB cable. AAA batteries are not included. - Easy to use: large LCD screen displays all readings on one view, including user code, age, gender, grip value in pounds or kilograms, and grip status. The maximum grip value and the power level (weak, normal, strong) can be stored and retrieved for comparison. - Data storage and tracking: stores up to 19 user-definable data profiles; records can be viewed anytime; after testing, shows how the grip strength has increased or decreased since this test. - Use scenarios: for athletes and coaches to monitor grip strength during training; for rehabilitation to track recovery after hand or forearm injury; for clinicians or trainers to screen and monitor hand function over time.