$75 to calibrate a torque wrench?

click style wrenches are not accurate and are not really worth calibrating IMHO. The reason is they only tell you a minimum torque was applied and not the true torque on the fastener. The click wrench is also going to depend on how you the individual pulls the wrench for the release. I would say see if someone around you has a external transducer and pull the wrench on a joint with the transducer in the middle. This will give you an idea of where the wrench is at. For home use and car use that is good enough. If you were doing something like air craft mechanics or something that you require to be dead nuts accurate then there are better solutions. For me I use to take my click wrench into my works calibration lab and verify torque every once in a while and it was never far off but I would never pay for a calibration that can be so easily changed by human control.