Of course, all the test instrumentation we used had to have gone to the cal lab. It was your responsibility as the test engineer, to make sure that the units were in cal or all the data you took would be invalid. Once a year was common. And, we know that to prove it was in cal it had to have that cal sticker. Now, a lot of
bigger equipment has plenty of room on the front for a small sticker (it had to be visible on the front was the rule).
But, as I remember those little Tek TM plug-ins were so small - there was really no room for a sticker on the front. Yet, the cal lab put that damn sticker on the front come hell or high water. And it would sometimes be a real nuisance because it would inevitable cover up some of the important setting information for some switch or other information. That used to really annoy me.
I also remember that, as a lot of labs may have, we had some really good test equipment and some that was - um, not so good, or not as new. You always wanted that new cool stuff when you went to get your test equipment for a test. Let the other poor schmuck get the old junk.
So it was always a bummer when the good HP 8566 Spectrum analyzer was in cal. Then you had to settle for the previous model. Same for other items - you know.
So sometimes in order to get the thing you wanted, you might devise a reason to do some work with the piece of gear you were going to need in a week or so, so nobody could come by and grab it.
Sneaky ...