Digital Aquatics ReefKeeper Module RKM-SL2v2

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Digital Aquatics

The RKM-SL2 is the newest System Lab module from Digital Aquatics. It's a big leap forward with fully (and individually,) isolated ph and salinity ports. On top of that, the Digital Aquatics salinity probe is equipped with full digital temperature compensation built in! This make it easy to calibrate and ideal for testing a variety of tanks. Whether you're mixing for a water change, monitoring your main system, checking up on a quarantine or frag tank the SL2 with conductivity probe will report a true and accurate value!

The SL2 also allows for another temperature probe to be added to the system for redundant monitoring as well as two more switch inputs; great for ATO systems or leak detectors.

The DA salinity probe is nearly 30% more cost effective than competitive options and when cared for and kept clean our probe will last for many years. Great quality and value is part of our commitment!

Multiple Inputs
The RKM-SL2 has a variety of input ports providing a broad range of monitoring options. It's a powerful addition to either a ReefKeeper Elite or the ReefKeeper Lite system!

1 x pH port
The pH port on the SL2 is an isolated pH port. This all but eliminates the affect ground loops and system interference when using multiple pH probes. Any standard pH probe with a BNC interface should work with the SL2.

1 x Salinity port
The salinity port uses the DA Salinity probe on this completely isolated port. The SL2 salinity port reports back salinity in PPT.

1 x Temperature Probe port
Digital Aquatics Temperature Probe

2 x Switch ports
The switch ports can be use with float switches or other contact devices to run Auto Top Off (ATO) systems, or trigger other custom events.

The SL2 also has upgradeable firmware so you can take advantage of our developing feature set; and firmware updates are always free!

Product Specs

  • LED Status Indicator
  • Temperature Port
  • pH Port
  • Two Switch Ports
  • Salinity Port
  • Two Bus Ports
  • Physical Dimensions: 1.0" x 2.25" x 4.30"
Package Contents
  • One RKM-SL2 Unit
  • One 6' Bus Cable
  • Two Mounting Screws
  • ReefKeeper Elite - Supported
  • ReefKeeper Lite - Supported
  • ReefKeeper 1 - Not Supported
  • ReefKeeper 2 - Not Supported

    Manufacturer Info

    Digital Aquatics Aquarium Supplies
    Digital Aquatics was founded in 2004 and has quickly become the most recognized name in aquarium automation. Since the company debuted the original ReefKeeper 1 (now known as the RK1) in 2004, they have gone on to create some of the most flexible, innovative and cost effective aquarium controllers on the market. The revolutionary ReefKeeper Elite (RKE) was unveiled in 2008 and the affordable ReefKeeper Lite (RKL) came out shortly thereafter to appeal to more budget-conscience aquarium hobbyists. In 2010, Digital Aquatics released a reptile version, the HerpKeeper, as well as the aptly named PondKeeper. ReefKeeper controllers simplify aquarium keeping duties by monitoring and controlling a variety of water parameters and equipment including but not limited to lighting, water flow, heating, cooling, pH and ORP.

    TampaMan from


    Experience Level: Intermediate

    Great product, need the probe

    I bought this module in hopes to use the salinity probe. However, DA is having issue with this probe and it is currently unavailable for purchase. I was told that all existing customers (who purchased and returned the faulty probes) will get the first run of the new probes. So if you are interested in the salinity probe, I would not buy this module until the salinity probes are generally available again. Other than that, the temperature and PH probes work great. I am also using the switch ports for auto top-off and for alarming/pump shut-off in my refugium with the DA float switches. Great product, but I wish I could comment on the salinity probe.

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    Experience Level: Intermediate

    Good product

    I'm only using the PH portion, it works great. As with all D/A products the documentation is non-existant, but once you get it figured out it's a great product. Make sure you update the firmware of all modules online before using.

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    Experience Level: Intermediate

    Great Product

    Now I have an ATO for my BC14. I will be ordering a SG probe soon to go with this. I already have this on another tank with SG and Ph probes and they are perfect!

    1 out of 1 found this review helpful

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