Measures 0-30 lbs. in 1.0 lb. increments and kilogram scale. Calibration certificate included with accuracy = 0.3 lb. The Black B&L Engineering Mechanical Pinch Gauge known as the "Gold Standard" in pinch strength (Key, Tip, and Palmar) measurement. It is used by physicians and therapists in clinics and rehabilitation centers worldwide. Fitted foam storage box included. Two-year warranty!