I did not read your 2nd post when I corrected my reply.
As said microscop-camera as such came at once to my mind, more so as that thing was filed at my archive. But I forgot that name and thus could not find it at my archive. And as said that tape-measure confused me, I did not remember it, and today I thought it to be related to the baseboard. Thus my idea of repro-camera. But I overlooked that the tape-measure may relate to the bellows extension instead...
I wish I had a better memory.