Best to just Google Torque Wrench Calibration in your area... I live in NASA territory here in Houston and use Rothe Precision Calibration & Metrology. It's $35 for wrenches up to 250 ft/lbs and unless you use it every single day, good to last for awhile. Using it in aviation, a yearly stamp is a requirement so I just do that and bring it home for use in the garage too. Just don't drop it lol