In an effort to keep costs low, I decided to simply sell the firmware that you can upload to your own M5 StickC allowing you to DIY your own BrewBench Stick Plus for $45 that will connect to the BrewBench Monitor App.
1 x BrewBench Stick Plus Firmware - $5
After purchasing the BrewBench Stick Plus Firmware you will get a download link to download the firmware. You will then use Arduino Studio to upload this to the M5 StickC Plus.
1 x Temp sensor probe - $9
1 x M5 StickC Plus - $20
1 x ENV - $11 (Not Required) Used for Ambient