My Teensy-LC came in the mail (thanks guys!) and I immediately soldered some pins onto it for breadboard testing. After some light reading I got everything up and running inside the Arduino IDE and was ready to test my Atlas pH probe, unfortunately there wasn't much testing to be done since I immediately ran into the same problem I had with the Raspberry Pi. Despite having the correct wiring as per Atlas Scientific's documentation I'm unable to get any sort of response from the probe over UART, I even threw it onto a Mega 2560 just to recreate their documents exactly and got the same results. I'll be contacting their technical support and hopefully I can get this resolved, in the meantime I'll be doing some research on other sensors and getting more savvy with writing programs.