One-sided? It would be weird if most of their emails were NOT about electricians' tools, since that is, and always has been, their core market. Like... it seems to me you have very odd expectations!
If Fluke exited the lab, what products would they be giving up exactly?? They have three bench multimeters (all rebadged Teks), and a few data acquisition products. That's it, as far as lab gear. And all of that is also sold by Fluke Calibration.
Bear in mind that Fluke Calibration makes a whole bunch of lab gear, but
Fluke Calibration is run as a separate company (I'm not sure about the exact corporate structure, but it's listed under "Other Fluke companies" on fluke.com), so their products won't be in the regular Fluke newsletter. Fluke Cal has its own newsletter you can sign up for:
https://us.flukecal.com/subscribe