We have a company that comes in the shop every month picking up and dropping off the shops wrenches.They calibrate ours yearly and the shop wrenches all rotate so different ones get done on different months.That way we are never without a torque wrench.One 1/2" dr will get done one month and another may get done the next.Same with 3/8" and 3/4".They also certify our pressure gauges and dyno's.I had them calibrate my Proto 1/2"dr a few months back at a cost of almost $60 picked up and delivered.
