Their website sucks. We complained to them about it years ago. Most all torque wrenches are accurate to within 2%. I have a local company that repairs wrenches and precision measuring instruments that can calibrate and certify to within 1% or less. Most of the work they do is for John Deere. @HALIFAXHOPS calibrated torque wrenches when he was in the military and he is quite knowledgeable on the subject.These look pretty good
https://www.harborfreight.com/hand-.../12-in-drive-digital-torque-wrench-64916.html
3% accuracy Mac does not even list their spec on their website.....
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Usually just a year. A few of the models I could get ratchet head kits covered for a few years after.No torque wrenches have much warrantee. Even Snap on , Matco, Mac etc.
Doug
A couple of years ago, I purchased 2 Craftsman torque wrenches, one a 3/8 drive, and the other a 1/2. First used them about 6 months ago during a refresh of my rear axle. Both head ratchets spin and will not set without manipulating the clockwise/counter clockwise lever multiple times. The 1st use of the 3/8 drive, snapped off a bolt from apparent improper factory calibration. Anyway, both are the cheapest, most POS tools I’ve ever bought. Warranty on mine was one year. I trashed them both.......Jim
That's the way they should be stored at the lowest setting. They should be broken three timers at the highest needed setting three times before use to free it up.My Craftsman 1/2" Micro is almost 45 years old. I always turn it down to 20 ft-lbs after use. I have had a couple times when it seemed not to function correctly. Broke 1 head bolt. This thread convinced me I should get a second quality torque wrench to "calibrate" it with each use. My first engine builder was extreme detail guy. He had 2 Craftsman Micro's which each time used, he coupled them to test the equality of settings. He also required they be turned down to minimum setting after each use.
That's the way they should be stored at the lowest setting. They should be broken three timers at the highest needed setting three times before use to free it up.