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My had had several craftsman torque wrenches and now says he'll never buy another one. they have plastic parts on them which tend to break easily. if you drop it you can destroy it in just a couple of seconds. they also tend to self-destruct during normal usage after enough time. I have one also which he gave me for Christmas. I don't use it very frequently, just when I really need one. but it has worked very well for me. My dad says is looking at Snap-On for future torque wrench purchases.
Easy way to calibrate your "click" type tool is to pull it against a "beam" type torque wrench to verify it is within specs. This is very necessary when doing engine work or anything that requires an exact measure.
As you might have figured out, there are two types, a click type and a beam type; the latter maintaining its accuracy much, much longer over time with the click type being more convienent.
The beam type is more difficult to damage compared to the click type and it will remain in calibration nearly forever if its not used too often (the way we use them).
I bought my 100# beam back in the '70s. It remains calibrated to this day.
I also have an inch-pound click type that goes up to about 25 lbs. I've never checked its accuracy but primarily use it for torx screws on my Harley and bicycle which list most of their torque specs in ranges, like 9-12 in-lbs. etc.
I'm sure you noticed that someone recommended when calibrating a click type to use a beam type. That must say something for beam types, eh? I believe over time, they are a better investment.