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I love torque wrenches, because they let me ensure that dangerous parts like lawnmower blades are properly tightened. But what if you didn’t need the torque wrench (which are pretty damned pricey) at all? A company called Stress Indicators Inc. has invented SmartBolts, which feature a red dot in the head when loose. Once the bolt is tightened to the proper torque, it turns black:
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