Neptune Apex Probe Module 2 Hydrometers & Refractometers Straight design for standard aquarium

Straight design for standard aquarium plumbing jobs

It may be grape to azure or any shade between

Faster RO Production for Larger Tanks and Mixing Stations

As small juveniles they tend to be yellow

Neptune Apex Probe Module 2 Hydrometers & Refractometers Straight design for standard aquariumNeptune Apex Probe Module 2 The Neptune Apex Probe Module 2 adds salinity or conductivity monitoring, temperature compensation, six digital inputs, and AquaBus expansion to a compatible Apex aquarium controller system. PM2 Salinity and Conductivity Expansion The PM2 is designed for aquarists who want continuous conductivity or salinity monitoring through their Apex system. Salinity stability is especially important in reef aquariums, quarantine