Extended operation range and ft-lb, In-lb and Nm units. Easy to use by production line or quality control inspector. +/-1% accuracy (of reading from 10-100% of maximum range). Large easy to read digits. Patented rotary bezel allows for easy viewing of the large display at any angle. Non length dependent. Push on the handle any where and retain accuracy. Three auto convert engineering units (ft-lb, in-lb, Nm) Three way light system (yellow, green, red) with buzzer and target zone for obtaining the desired torque. One button target torque setting. Operates on standard 9 volt battery. Replaceable torsion drive. Built on durable chrome (not painted) body with nylon-6 rotary bezel and cover. Ergonomically designed for user comfort. Peak hold and track modes standard. Durable platform without internal moving parts. SPECIFICATIONS: Features: Proto Electronic Torque Wrench Accuracy: +/- 1% of Indicated value from 10-100% of range +/1 one increment Power: 9 volt standard battery up to 40 hours. Modes: Track and Applied Torque Hold (Peak Hold) Units: Quick change and Auto convert Ft-lb, In-lb, Nm Display: Liquid crystal with large .5 tall digits and variable contrast for extreme temperatures. Sampling rate: 2500 samples per second allows user to pull on the wrench as fast as needed and retain accuracy. Icons: Units, Mode, Target Torque, Direction% for target zone and Low Battery. Lights: Yellow (under target zone), Green (within target zone), Red (over target zone). Keypad: Sealed Membrane. Case: Plastic Protective Case Certification: NIST traceable certification supplied with each wrench. Product No.: J6345 Torque Range: 0-21 (ft./lbs.), 0-250 (in./lbs.), 0-28 (Nm) Graduations: 0.01 (ft./lbs.), 0.1 (in./lbs.), 0.01 (Nm) Drive Size: 3/8 Length: 10.63 / 270 mm Weight: 1 lb / .45 kg