The LXT I series digital torque tester is ideal for calibrating power screwdrivers with torque control. It features peak mode to capture the peak torque achieved during a test, real time mode to display torque transients, and peak down mode to capture critical first peak value. Standard 3/8″ drive is good for checking torque wrenches but not impact wrenches. All digital torque testers are sold in kit form complete with tester, hard carrying case, 2 smart driver adapters and AC charger/adapter. Do not use with impact or air tools (Ask for DI-1M impact wrench torque tester).