You can find two basic forms of torque wrenches available on the market, what're called "beam" wrenches and "micrometer" wrenches. Beam wrenches count on the built-in flexibility of any material. As torque is applied, the wrench flexes, while another rod, with a pointer at the end, indicates torque being applied on a scale. Micrometer wrenches are pre-set to the necessary torque on a vernier scale. An internal spring loaded mechanism measures the torque. Once the bolt is tightened to the specified torque it "clicks." Of both kinds of torque wrenches, the micrometer wrench certainly is the more accurate. Typically, they're rated to be accurate to four percent of torque set. However, this accuracy can simply be lost if the wrench is not reset to zero before storage. Beam wrenches don't have this possibility of losing their accuracy, but are less accurate right from the box. The accuracy of those beam wrenches is usually 12 percent, but can be...
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