Tekton Electronic Torque Wrenches Have Simple Controls & Straightforward Operation;The Large, Clearly-Labeled Buttons, Backlit LCD with Bold Fonts, & Real-Time Sensory Feedback From Lights, Beep Patterns, & Handle Vibrations Help You Easily Use the Torque Wrench;Sound & Vibrations Can Be Turned Off, But Lights Are Always Enabled;The Torque Wrench Has Three Measurement Modes: Torque, Angle, & Torque + Angle;An Onboard Gyroscope Allows the Ratcheting Action To Accumulate the Total Angle In Multiple Steps;Using An Off-Axis Tool Such as a Crowfoot Wrench or Torque Adapter Can Change the Effective Length Of the Torque Wrench;By Entering a Length Offset, the Torque Wrench Will Calculate the Necessary Torque Conversion;You Can Save Up To 10 Presets & Assign Them To Ordered Slots;Each Preset Stores Your Measurement Mode, Target Value, & Unit;Additional Features Include Saved History for the Last 50 Measurements, a Shortcut To Recall the Last Peak Measurement, Calibration Reminders, Over-Torque Warnings, Auto-Shutoff, & a Total Cycle Counter;The Wrench Is Accurate Within ±2% for Torque & ±1% for Angle & Is Calibrated To the ISO Torque Standard;This Wrench Includes a Case, a Serialized Certificate Of Calibration, & a 3/8 To 1/4 Inch Drive Reducer;The Electronic Torque Wrench Is Powered By 3X AA Batteries (Not Included with the Product).