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Digital Torque wrenches are instruments with which you can measure torque while doing the nuts or the screws. The old torque wrench is a beam type wrench which is fitted with a calibrated scale so that as the wrench moves it indicates the torque applied. This may be the cheapest but it is not that accurate. You may also check the others which came up in 1940s called the deflecting type which gives a maximum range to provide consistent and effective reading throughout the wrench. The other one is a click type with clutch mechanism. As soon as the fixed torque is reached the clutch slips showcasing so that the over tightening is avoided. This is highly effective and produces a positive action. With this, no damage is done to device and this can also modified with drills so the head of the screws are not scratched. The Torque devices, such as the torque screwdrivers and other digital instruments can be used as per the range they have been built with. The click type also is available in torque screwdrivers and this part of mechanism is commonly seen in electric and air screwdrivers. The slip off or the clutch is the key for torque wrench and the torque screwdriver instruments. You may also find electronic formats of these instruments with digital screen, USB support and memory for the peak torques applied. The digital torque wrenches have the technological support and these can be purposely used for quality assurance purposes. For the higher level of torque, the automobile companies use pneumatic torque screwdrivers that provides a constant supply to give the desired result. Before buying, you must check the rating and the range of the torque so that it can be used with the appliance.