I have a Craftsman click type torque wrench that is 25+ years old that I have kept in perfect condition (never abused). I have never had it calibrated but I only use it for suspension work like ball joints, tie rods and control arm bolts. For engine assembly I have 2 Warren and Brown deflecting beam torque wrenches, one 3/8 and the other 1/2 drive. They are made in Australia and due to their unique design are considered to be the most accurate torque wrenches. According to the manufacturer they never need to be calibrated as long as they are treated properly. I have assembled several engines with these wrenches and have never had a problem
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