PROXXON MicroClick 200 Torque Wrench 1/2-Inch

I bought this wrench a few years back to fasten the wheelbolts on my car and motorcycle to specified torque. So that's occasional use. I always reset it to its minimum setting. It developed a problem with the lock knob coming on, but not off. Stuck. I have since read some German reviews of people reporting the same problem. It's easily solved if you're inclined to do this yourself (owning one of these means you probably are): you pry off the yellow end-cap, which is simply held in place with sticky tape, remove the tape and now you see a screw. Turn it antoclockwise for a bit (you need a simple Allen keyfor this) and you can welcome Bob back into the family. For a more permanent solution unscrew it fully (don't need to pull out the knob), apply some Loctite and screw it back in, to its proper depth. It's the Loctite that has failed in the first place, allowing the screw to go too deep as you change settings.A bigger problem was the inaccuracy. The rear wheel of my motorbike needs its bolts set at 105 Nm (yes, I'm metric). Setting the wrench this turned out to be just 90Nm. So that is not within 3%. In fact, it is not within 10%, and you don't want your rear wheel taking off on its own. Now the good news is that these wrenches are easily calibrated (remove the little plastic plug on the side, once again use Allen key). You'll need a calibrated counterdevice, like another wrench that has been calibrated or one of these digital torque adapters, but a known weight (or digital scales) and tapemeasure will get you there too. Ok, now we're past that hurdle here's my final gripe: after adjustment it is now ok in the midrange, about six percent under in the low range and six percent over in the high range. In other words, the inaccuracy is not linear and cannot be fully adjusted for. Now I know one is meant to believe this normal for any torque wrench using a spring. Go tell Norbar. I have thirty year old torque wrenches from them that are still accurate across their entire range. Perhaps you should buy British after all :)