EDIT: Argh! it ate parts of this in brackets...
On the flip side, I brought my car in to get the tires rotated once as the fronts were getting fairly worn. Yeah, it's easy, but I was short on time, and with a lift they could do it way faster than me.
So I drop off the car, and 10 minutes later the tech comes over to me:
Him: You don't want the back ones up front, there's way more tread on the front ones
Me: No there isn't. Did you actually measure it?
Him: Yes there is, here's the sheet where I recorded them.
<Hands me a sheet with some treat depth numbers on it>
Me: That's amazing! Because I have that same sheet in my glovebox from six months ago when I got them rotated here and according to your measurements my tires have all grown 2/32" of tread in the past 10,000 miles. And that;s before taking into consideration I know the fronts have less tread.
Him: No they don't.
Me: OK, show me.
<We wander over to by the lift>
Him: See?
Me: Nope. The fronts clearly have less tread.
Him. No they don't
Me: Can I see a gauge?
Him: Can't let a customer use tools or touch a car on a lift.
Me: Then can I see you measure them.
Him: <sigh> fine
< He proceeds to actually measure them, and lo and behold they've now lost tread since the last time, and the fronts are 2/32 worse than the backs >
Him: I guess I swap them like you said, but I still thing the fronts have more tread.
Me: < thinking to self > not coming back here again
Moral of the story: There's no way that guy put a gauge on those tires, and sometimes someone who claims to be able to measure stuff without measuring is wrong. Even if you can do it, plenty of people who think they can really can't. So the boss's boss was dead on in getting you to actually measure them. Hell even someone who's normally good at it can have a bad day.
On the other hand, the "No, they are digital, they don't need calibration" is hilarious.