<a href=showthread.php?s=&postid=7265801#post7265801 target=_blank>Originally posted</a> by clp
The features of the expansion box are:
- Add pH, ORP, and temp probe or 2 pH and a temp probe.
- Has 4 digital inputs.
- Works on AC3 or AC3PRO.
- Up to 7 expansion modules can be used. For a AC3PRO that would make a total of 26 probes, and 28 digital inputs.