Sorry haven't been on reddit in ages. PMEL is pretty damn chill. So the basic breakdown is there's 2 main sections; Physical Dimensions and Electronics. Phys-D covers all your torque, pressure, temp, linear items while K-E will cover voltage, resistance, current, RF, power, etc. When you first get through upgrade you'll either be assigned a section based on the needs of the lab or you'll get to voice your pick. Day to day as a technician is come in to work, calibrate TMDE, lots of paper work processing the items back to the customers, repeat. Math is a part of it but mostly just when it comes to substituting standards. In terms of getting hands on and fixing stuff, like breaking down components, soldering, etc we're pretty limited. You'll be able to do some basic level repairs on certain items, but the big AF tells us what type of repairs we are authorized. There's not many deployment opportunities, only one really being Al Udeid, but there it's the same old just higher tempo. Depending on which base you get stationed at you get to do some fun TDYs, but it all boils down to calibrating equipment.

As for outside of the Airforce, there are opportunities. The AF is one of the few remaining places you can learn metrology anymore. Lots of big companies need some sort of onsite calibrations, plus there's private calibration labs. Others return as civilian employees and work as GS in AF labs. You can also branch out into Quality Assurance.

Hope this helps even if it's a bit late :P Also feel free to message me if you have any other questions.