I was wondering where everyone sends out their torque wrenches for calibration and how often? Also, is there any tool I can use to do this myself? My torque wrench is a 3/8 snap on.

 

well being snap on, find local rep and send it with them 50$ or so and comes with new calibration sheet. i have $30k in snap on tools and having them calibrate my tq wrenches is only way i go. idk of any tools (personally) that you can calibrate it with however i know there are tools you can verify with (national chain tire shop i worked for had one)