Why does BRS recommend this? Having the ability to monitor the salinity of your reef tank is a very valuable piece of information. Usually, if something is to go wrong with your tank, you will usually see a change in salinity from temp, to a top off unit being stuck on, if you have a Neptune Apex Controller we highly recommend investing in the PM2 module and salinity probe. Add the Salinity Module: PM2 to your Apex Neptune System. Real-time monitoring of salinity in reef aquarium Module has extra Temp Probe port I/O Switch Inputs for ATO, feed buttons, leak alarms, etc. Probe Sold Separately. Features of the Neptune Systems Salinity Expansion Module: Monitor/Control Conductivity/Salinity and temperature 4 Measurement ranges (0-900 uS/cm, 0-9.0 mS/cm, 0-90.0 mS/cm, 0-50 ppt) 6 digital inputs for float switches, water on floor sensors, pressure sensors, etc Full data logging support in Apex Base module Up to 240 AquaBus modules can be added to the Apex system Plug and Play - Automatically recognized when installed into the system 2 AquaBus connectors for flexible expansion via AquaBus Comes with 3′ AquaBus cable Galvanic Isolation for accurate and reliable probe readings Led Status Indicator Upgradeable firmware Compatible with all Apex systems
