Still working on some issues, but things are getting better:

* New, better-sealed sample chamber:

* New, better-sealed and less-noisy data on a new real-time 5" display

* Adafruit Power Boost 1000 upstream of the Raspberry Pi. This seems to be an actual pass-through USB power source...I had been getting so many elusive and random power outages that would kill the Pi, corrupt its SD card and forced me to reinstall everything, so this is hopefully a little insurance against that.