I dont believe it is released yet but I will post again once I find out. It uses both analog and digital. Don't believe it is a control device, monitor only.

from what i read bud tracker will be relatively cheap for the software itself because there is also cost for the devices you need like a ph, ec, tds probe, temp/humidity sensors and whatever else you want to monitor. what i like is once i have this setup i can then setup logging and alerts directly to my email or smart phone. how nice would it be to setup a range for your ph that is being read every hour and get an alert on your phone that attention is needed?