you could employ something like the following http://www.torqueleader.com/Product_Selection/Product_selector/Product_Selection/Calibrate/PETA_Torque_Analyser
to regularly calibrate it, if you have a critical application (assembling satellites ?)
how often it needs to be calibrated depends on the conditions of use, how critical the use is, frequency of use, and precision of use (and how carefully the tool is used)
you would need to decide on what level of quality control you desire to determine how often it needs to be calibrated, and also how you want to go about calibrating it.
I only use mine for simple stuff like screwing in breakers, so I check it once in a while with another more accurate wrench, and I figure if its +/- 5 ft lbs its probably ok (or at least its better than not using it at all)
jmshio
to regularly calibrate it, if you have a critical application (assembling satellites ?)
how often it needs to be calibrated depends on the conditions of use, how critical the use is, frequency of use, and precision of use (and how carefully the tool is used)
you would need to decide on what level of quality control you desire to determine how often it needs to be calibrated, and also how you want to go about calibrating it.
I only use mine for simple stuff like screwing in breakers, so I check it once in a while with another more accurate wrench, and I figure if its +/- 5 ft lbs its probably ok (or at least its better than not using it at all)
jmshio