Now any 1/4"or 3/8" drive ratchet can be used as a precision torque wrench. Easy to read LCD screen, signal L.E.D. light and torque alarm . Five selectable torque units: kg-cm, kg-m, in-lb., ft-lb and N-m. Built-in memory stores the last 50 torque value readings and logs highest torque achieved. Automatic shut off extends battery life . Compact design takes up less room than conventional torque wrenches . Includes durable protective carrying case. Available in 1/4" drive (with 2.2-22.1 ft lb range) and 3/8" drive (with 19.9-99.6 ft lb range).