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Probes & Controller Accessories

Aquarium controllers have seemingly endless probes and add-ons to help you achieve your reefing goals. Here you'll find everything from replacement probes, maintenance items, accessories, and controller add-ons for the most popular brands like Apex, GHL, and Hydros.
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73 Items

  1. Double Junction Lab Grade pH Probe
    15 Reviews
    Bulk Reef Supply
    Double Junction Lab Grade pH Probe
    $79.99 $79.99

  2. Double Junction Lab Grade ORP Probe
    Bulk Reef Supply
    Double Junction Lab Grade ORP Probe
    $84.99 $84.99

  3. Lab Grade Double Junction ORP Probe
    Neptune Systems
    Lab Grade Double Junction ORP Probe
    $104.99 $104.99

  4. Salinity Probe Stability Kit (SPS)
    11 Reviews
    Vivid Creative Aquatics
    Salinity Probe Stability Kit (SPS)
    $27.95 $27.95

  5. Temperature Probe
    17 Reviews
    Neptune Systems
    Temperature Probe
    $34.99 $34.99

  6. HI98509 Checktemp 1 Digital Thermometer
    11 Reviews
    Hanna Instruments
    HI98509 Checktemp 1 Digital Thermometer
    $59.99 $59.99

  7. 25-Pack HI70024P 35ppt Salinity Calibration Sachet
    5 Reviews
    Hanna Instruments
    25-Pack HI70024P 35ppt Salinity Calibration Sachet
    $27.00 $27.00

    View Details
  8. Smart Stir - Magnetic Stirrer for Test Kits
    31 Reviews
    AutoAqua
    Smart Stir - Magnetic Stirrer for Test Kits
    $32.99 $32.99

  9. Standard Aquarium Controller Board
    5 Reviews
    Adaptive Reef
    Standard Aquarium Controller Board
    From: $153.99

    Choose Options Notify Me When In-Stock
  10. MXM Mobius Wireless Control Module
    22 Reviews
    Neptune Systems
    MXM Mobius Wireless Control Module
    $119.95 $119.95

  11. Apex Controller Toggle Box
    2 Reviews
    Adaptive Reef
    Apex Controller Toggle Box
    $134.99 $134.99

  12. Audible & Visual Apex Alarm
    Adaptive Reef
    Audible & Visual Apex Alarm
    $109.99 $109.99

  13. In-Line Probe Holder Manifold
    4 Reviews
    Adaptive Reef
    In-Line Probe Holder Manifold
    $131.99 $131.99

  14. 7.00 pH Calibration Fluid
    Neptune Systems
    7.00 pH Calibration Fluid
    $1.99 $1.99

  15. Neptune Systems Conductivity Calibration Solution - 53000 Microsiemens
    7 Reviews
    Neptune Systems
    Neptune Systems Conductivity Calibration Solution - 53000 Microsiemens
    $2.99 $2.99

  16. Milwaukee pH Calibration Fluid - Single Use Packet
    36 Reviews
    Milwaukee Instruments
    Milwaukee pH Calibration Fluid - Single Use Packet
    From: $1.59

    Choose Options Notify Me When In-Stock
  17. 7.01 Calibration Solution Box of 25 - Milwaukee
    Milwaukee Instruments
    7.01 Calibration Solution Box of 25 - Milwaukee
    $22.99 $22.99

    View Details
  18. 4.01 Calibration Solution Box of 25 - Milwaukee
    Milwaukee Instruments
    4.01 Calibration Solution Box of 25 - Milwaukee
    $22.99 $22.99

    View Details
  19. Watchdog Leak Detection Alarm
    7 Reviews
    Glentronics
    Watchdog Leak Detection Alarm
    $15.99 $15.99

  20. Refractometer Calibration Solution
    13 Reviews
    Bulk Reef Supply
    Refractometer Calibration Solution
    $7.99 $7.99

  21. MPR Magnetic Probe Rack
    80 Reviews
    Neptune Systems
    MPR Magnetic Probe Rack
    $44.95 $44.95

  22. CustomCradle Pro Tube Holder
    Innovative Marine
    CustomCradle Pro Tube Holder
    $29.99 $29.99

  23. MPO Duo - Magnetic Probe Organizer
    AvidAqua
    MPO Duo - Magnetic Probe Organizer
    $39.95 $39.95

  24. MPO Quatro - Magnetic Probe Organizer
    1 Review
    AvidAqua
    MPO Quatro - Magnetic Probe Organizer
    $44.95 $44.95

  25. MTO - Magnetic Tubing Organizer
    AvidAqua
    MTO - Magnetic Tubing Organizer
    $44.95 $44.95

  26. LLS Liquid Level Sensor
    29 Reviews
    Neptune Systems
    LLS Liquid Level Sensor
    From: $47.99

    Choose Options Notify Me When In-Stock
  27. LD-3 Optical Multi-Surface Leak Sensor
    2 Reviews
    Neptune Systems
    LD-3 Optical Multi-Surface Leak Sensor
    $42.99 $42.99

  28. MOS Magnetic Optical Sensor
    10 Reviews
    Neptune Systems
    MOS Magnetic Optical Sensor
    $41.99 $41.99

  29. LD-2 Solid Surface Leak Detection Probe
    1 Review
    Neptune Systems
    LD-2 Solid Surface Leak Detection Probe
    $34.99 $34.99

  30. LD-1 Low Profile Leak Detection Probe
    1 Review
    Neptune Systems
    LD-1 Low Profile Leak Detection Probe
    $34.99 $34.99

  31. Replacement Dissolved Oxygen Probe Membrane Kit
    Neptune Systems
    Replacement Dissolved Oxygen Probe Membrane Kit
    $79.99 $79.99

  32. Low-Profile Advanced Leak Detection Probe
    4 Reviews
    Neptune Systems
    Low-Profile Advanced Leak Detection Probe
    $31.99 $31.99

  33. Solid Surface Advanced Leak Detection Probe
    16 Reviews
    Neptune Systems
    Solid Surface Advanced Leak Detection Probe
    $31.99 $31.99

  34. PINPOINT pH Replacement Probe
    17 Reviews
    American Marine Inc.
    PINPOINT pH Replacement Probe
    $42.49 $49.99

  35. PH-200 Waterproof pH Meter
    1 Review
    HM Digital
    PH-200 Waterproof pH Meter
    $63.99 $79.99

  36. Low Range pH/Conductivity/TDS Combo Pen HI98129 - Hanna
    2 Reviews
    Hanna Instruments
    Low Range pH/Conductivity/TDS Combo Pen HI98129 - Hanna
    $209.99 $209.99

  37. Lab Grade Dissolved Oxygen Probe
    3 Reviews
    Neptune Systems
    Lab Grade Dissolved Oxygen Probe
    $789.99 $789.99

  38. Refractometer & Hydrometer Calibration Standard
    4 Reviews
    Brightwell Aquatics
    Refractometer & Hydrometer Calibration Standard
    From: $5.57

    Choose Options Notify Me When In-Stock
  39. Replacement Probe for Aquarium Temperature Controllers
    1 Review
    Ink Bird
    Replacement Probe for Aquarium Temperature Controllers
    $7.19 $8.99

  40. Aquarium Controller Board Shelf Accessory - Black
    Adaptive Reef
    Aquarium Controller Board Shelf Accessory - Black
    $44.99 $59.99