The CDI 6004-F-ETT Electronic Torque Tester has a 3/4 Inch Drive and can test between 60-600 Ft lbs or 81-813 Nm. Unlike a torque calibration system, which can be used to generate a torque wrench certification, the ETT is a portable, battery powered stand-alone torque tester. It can also be used on AC power. Its primary use is to check the accuracy of dial and click type torque wrenches and torque Screwdrivers to maintain their accuracy in between calibrations. With the addition of a joint rate simulator, the ETT torque wrench tester can also check stall and clutch type pneumatic and electronic torque tools. It should not be used with any impact or pulse type tools.