Originally Posted by
easyupbug
Any cheap torque wrench should be calibrated. I only have experience with a neighbors Harbour Freight but it was so bad he took it back and was advised by the manager to come back when they get a new batch in. The new one was a tiny bit low reading and we checked it again a month or so ago, so maybe a year later, and it is still where it was. He says he always returns it to zero which is necessary.
The CDI torque driver is calibrated and comes with calibration chart on the back of the packaging. CDI is a brand owned by Snap On.
It's not a torque wrench, but rather a torque limiting device that will ratchet once at the torque setting. It will not allow you to torque above whatever you set it at. The bad is that it only works in one direction. Neutral is it is a disposable device and I think considered worn out after so many thousand clicks - the mechanism will click at lower and lower torque as it wears out. For a home user, probably you'll get a decade of use out of it.