My wrench is, sort-of (he says raising his hand).
We have a torque wrench calibration box at work and I take my "good" wrench in periodically. I don't have a certificate for my wrench but I am checking my wrench against certified test equipment.
That's handy to know

I've read all sorts of horror stories about crappy torque wrench calibration - I had a super nasty one from Harbor Freight that didn't click under any load ever!