Question for all of you that have or SELL controller's

[The Grizz]

Originally Posted by Coleus

The standard package and unit won't allow you to measure salinity. To monitor salinity, you need to buy the probe ($130 ) and the PM2 module ($92)

Also The Apex base unit supports 3 probes. (Temp, pH, and pH/ORP). The Apex. Lite only supports 2 (Temp, pH)

Hey Tai, thanks for jumping in here.

So can I add the PM2 to the Apex lite? That would give me 2 probes on the base unit and 2 on the PM2. Is the ORP probe a must have?