Great Aquariums Start Here
Live Chat Support
    Free Shipping On $175+
  • FREE Shipping On $175+
  • 14-Day Low Price Guarantee
  • 14-Day Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on
Orders Over $175
Standard ground shipping (1-7 business days) starts at a low $5.99 and most orders over $175 ship FREE. Learn More
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More
Home » Saltwater Aquarium Supplies  » Testing Equipment  » Monitors & Controllers  » Multi Item Monitors & Controllers  »  Digital Aquatics ReefKeeper Module RKM-SL2v2
Digital Aquatics ReefKeeper Module RKM-SL2v2

Digital Aquatics ReefKeeper Module RKM-SL2v2

Temporarily Out of Stock: ETA 2-3 business days
Item #:
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

Digital Aquatics ReefKeeper Module RKM-SL2v2 Information

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.
    + Display More

    Digital Aquatics ReefKeeper Module RKM-SL2v2 Reviews

    Average Rating
    (3 reviews)
    Sort Reviews By:

    Great product, need the probe

    Reviewers Rating Great

    Posted: 3/11/2011
    4.0 5
    Experience Level: Intermediate

    Comments: 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.

    1 of 1 People found this review helpful, did you? Yes No

    Good product

    Reviewers Rating Excellent!

    Posted: 12/27/2010 from PINELLAS PARK, FL UNITED STATE
    5.0 5
    Experience Level: Intermediate

    Comments: 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.

    Did you find this review helpful? Yes No

    Great Product

    Reviewers Rating Excellent!

    Posted: 4/2/2010 from FORT WORTH, TX UNITED STATES
    5.0 5
    Experience Level: Intermediate

    Comments: 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 of 1 People found this review helpful, did you? Yes No

    Digital Aquatics ReefKeeper Module RKM-SL2v2 Window Navigation Prev Next Zoom Close
    We value your opinion & experience
    Thank you for taking the time to review our products!

    This is a Product Review for: Digital Aquatics ReefKeeper Module RKM-SL2v2

    First tell us about yourself.

    Name to display on the review: Location (ex: Anaheim, CA):
    Your experience level:

    How would you rate this product?

    Review Title:

    Write your review:
    (Please focus on product quality and performance)

    This item is temporarily unavailable but will be back in stock soon.

    Item #
    Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.

    Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

    Your Email:
    Just enter your email address below and we'll let you know when the product you are looking for becomes available!

    Item Code:
    Your Email:
    Add to Wish List
    Select Wish List:
    Comments (up to 200 characters):
    Quantity Desired:
    Quantity Received:
    Email Specials
    Subscribe to our newsletter feed.
    Newsletter Tips & Tricks! New Products!
    Discounts & Promos!
    Mar 16, 2015
    "This is probably the best aquarium supplies on line store in the world!"

    Mar 13, 2015
    "I truly love this place. The videos are what got me hooked."
    Sean the Chef

    Mar 11, 2015
    "The best inventory and prices! If you have a problem with your tank or livestock, they are the people to call!"

    Win a $100 Gift Card Sign up to get our best deals, expert tips and a chance to win $100 to spend at Marine Depot!