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After use, I unwind it all the way so its set to below zero torque
There's where you went wrong. Unwind to the last line above zero, so that you keep a small amount of tension on the spring to hold everything in place. It probably isn't broken, just something has become disengaged because it had no tension, probably around the cam/pawl or pawl/arm engagement if that's the type of mechanism, but other mechanisms are available, e.g. toggle links
gbj_tester
@Hovis
I have a torque wrench like so
After use, I unwind it all the way so its set to below zero torque, as someone once told me they can lose calibration if this isn't done.
Anyways, I stupidly just tried to use it before setting it to tighten a crankset, got to about 50Nm before I noticed it wasn't clicking. Now it appears to be fucked, clicks with really small torque even when I set it to 80Nm.
Have I permanently damaged it? If i send it off for calibration will they sort it? Or shall I just get another.