Description NEPTUNE SYSTEMS PM1 MODULE 49796 The PM1 probe module is just what you need if you want to monitor pH or ORP in your tank. And, there is an added bonus, you get an extra temperature port as well as six I/O switch inputs. This module is perfect for someone that wants to add an additional pH or ORP port to their Apex System. Compatible with all Apex Systems Dual Functionality: Choose Between pH and ORP Monitoring I/O Port for Breakout Box Connection 2 AquaBus Ports
