Thanks for the info, about to get one going I think!
Awesome! The atlas scientific stuff for pH was definitely the most expensive component, but the thing is amazingly rock solid. I was going to try and do my own analog circuit to run the probe, but after reading around I learned how big of a deal 'RF noise' is to the sensors, as well as direct current bias.
So basically, all the electronics around your probe (ballast, fans etc) can interfere with the analog circuit, noisey power source can interfere, but even worse, the stuff in the water- pumps, other sensors, cooler- provide the most noise. The atlas circuits have *full isolation*, so basically all the components run isolated from the ph sensor (think of it like running that component off of a battery, in space lol). They do it with light somehow- there's some chip that'll let digital signals and power go across, but uses light as the middle man (so no direct electrical connection).
At the end of the day, my pH sensor is the most stable and most accurate sensor I have. I track the error rate on my devices to see if any of em have chronic issues- bad wiring or something. The atlas stuff has an amazingly low error rate, and when it does happen, the chip deals with it very well.