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Controllers & Testing

Aquarium controllers are an essential part of a complete aquarium system. These sophisticated automation systems include a portfolio of accessories to monitor and control equipment like water level sensors, ATO pumps, and other devices.

At AquaCave, we offer some of the best selections and best prices on Aquarium Controllers and controller accesories for your marine, reef, and freshwater aquarium.

120 of 144 Items
  • Hanna Phosphorous Checker, Ultra Low Range HI736 Hanna Phosphorous Checker, Ultra Low Range HI736 Hanna Phosphorous Checker, Ultra Low Range HI736

    Hanna Instruments

    Hanna HI736 Phosphorous Checker, Ultra Low Range

    Hanna Phosphorous Checker, Ultra Low Range HI736 The HANNA HI 736 Checker HC bridges the gap between simple chemical test kits and professional instrumentation. The HANNA HI?736 is both accurate and affordable. The HI 736 CheckerHC portable handheld...

    $74.99
    Add to Cart
  • Hanna HI772 Marine Alkalinity dKH Checker Hanna HI772 Marine Alkalinity dKH Checker Hanna HI772 Marine Alkalinity dKH Checker

    Hanna Instruments

    Hanna HI772 Marine Alkalinity dKH Checker

    Hanna Marine Alkalinity dKH Checker HI772 Features at-a-glance: Easier to use and more accurate than chemical test kits Dedicated to a single parameter Small size, big convenience Ideal for: Aquaculture & Aquariums, Water Quality  HI772...

    $74.99
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  • Hanna HI774 Ultra Low Range Phosphate Checker - Marine Hanna HI774 Ultra Low Range Phosphate Checker - Marine

    Hanna Instruments

    Hanna HI774 Ultra Low Range Phosphate Checker - Marine

    Hanna HI774 Ultra Low Range Phosphate Checker - Marine Our HI774 Ultra Low Range Phosphate Checker will be essentially the same specifications as the HI736 Ultra Low Range Phosphorus Checker however it will not require a conversion but read directly in...

    $74.99
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  • Hanna HI718 Iodine Checker Hanna HI718 Iodine Checker Hanna HI718 Iodine Checker

    Hanna Instruments

    Hanna HI718 Iodine Checker

    Hanna Iodine Checker HI718 ***FRESHWATER ONLY*** Hanna Iodine Checker HI718 is extremely simple to use. First, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the instrument, press the button and read...

    $74.99
    Add to Cart
  • Hanna HI758 Marine Calcium Checker Hanna HI758 Marine Calcium Checker Hanna HI758 Marine Calcium Checker Hanna HI758 Marine Calcium Checker

    Hanna Instruments

    Hanna HI758 Marine Calcium Checker

    Hanna Marine Calcium Checker HI758 Calcium presence in water supplies results from passage over deposits of limestone, dolomite, gypsum and gypsiferous shale. Its concentration may extend from 0 to several hundred milligrams per liter,depending on its...

    $74.99
    Add to Cart
  • HYDROS Dosing Pump HYDROS Dosing Pump HYDROS Dosing Pump HYDROS Dosing Pump HYDROS Dosing Pump

    HYDROS

    HYDROS Dosing Pump

    HYDROS Dosing Pump The HYDROS Dosing Pump is a simple and affordable way to automate the addition of liquid supplements, trace elements, and two-part solutions to an aquarium. Connect the Dosing Pump to any available HYDROS Control Drive Port for easy...

    $72.75
    Add to Cart
  • Alkalinity Testing Reagent - 4L Concentrated

    CoralVue

    Alkalinity Testing Reagent - 4L Concentrated

    Alkalinity Testing Reagent - 4L Concentrated Concentrated Reagent Specifically for Alkalinity Testing Machines A concentrated reagent for both Focustronic Alkatronic and Kamoer KH Carer.  (See mixing instructions below) Kamoer KH Carer Mixing...

    $69.99
    Add to Cart
  • Hanna Instruments - Checker Plus pH Tester HI98100 Plus Hanna Instruments - Checker Plus pH Tester HI98100 Plus Hanna Instruments - Checker Plus pH Tester HI98100 Plus Hanna Instruments - Checker Plus pH Tester HI98100 Plus

    Hanna Instruments

    Hanna Instruments - Checker Plus pH Tester HI98100 Plus

    Hanna Instruments - Checker Plus pH Tester HI98100 Plus The HI98100 Checker Plus is the next generation of the original Hanna Checker pH tester. The Checker is the most popular pH meter in the world with over 1 million meters used since its introduction...

    $64.99
    Add to Cart
  • Hanna Checktemp® 1 Digital Thermometer - HI98509

    Hanna Instruments

    Hanna Checktemp® 1 Digital Thermometer - HI98509

    Hanna Checktemp® 1 Digital Thermometer - HI98509 The HI98509 Checktemp® 1 is a high-accuracy thermometer with a 1 m (3.3') flexible, silicone cable connecting the meter and the stainless steel probe. The sharp-tip penetration probe easily...

    $62.99
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  • Neptune Systems MPR Apex Magnetic Probe Holder

    Neptune Systems

    Neptune Systems MPR Apex Magnetic Probe Holder

    Neptune Apex Magnetic Probe HolderThe little new product we promised. It may be little, but it has been in demand for a long time. The MPR - Magnetic Probe Rack was designed specifically for the Apex and will hold our larger diameter temperature probe,...

    $59.99
    Add to Cart
  • Neptune Systems I/O Break Out Box

    Neptune Systems

    Neptune Systems I/O Break Out Box

    Neptune Systems I/O Break Out Box Advanced Monitoring & Control with the Breakout Box Seamless Integration with Apex Controllers: Designed for the Apex Controller, enabling up to six external switches for enhanced monitoring and control...

    $59.99
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  • Neptune Systems MOS Magnetic Optical Sensor Neptune Systems MOS Magnetic Optical Sensor Neptune Systems MOS Magnetic Optical Sensor

    Neptune Systems

    Neptune Systems MOS Magnetic Optical Sensor

    Neptune Systems MOS Magnetic Optical Sensor The Neptune MOS replaces the previous OS-1-M and features an updated design that fits into tighter spaces and helps to prevent water incursion into the sensor. The MOS plugs into an Apex FMM port and uses...

    $59.99
    Add to Cart
  • Neptune Trident NP: 2-month Kit Neptune Trident NP: 2-month Kit Neptune Trident NP: 2-month Kit Neptune Trident NP: 2-month Kit

    Neptune Systems

    Neptune Trident NP: 2-month Kit

    Neptune Trident NP: 2-month Kit Keep your Trident NP Nitrate and Phosphate Tester running smoothly by replacing your reagents on time. This kit is easy to use with clear instructions for hassle-free reagent changes. These reagents ensure consistent and...

    $59.99
    Add to Cart
  • Triton N-DOC Organics Test Kit

    Triton

    Triton N-DOC Organics Test Kit

    Triton N-DOC Organics Test Kit Application:  Deliver insights into complex organic systems in seawater: Carbon and Nitrogen Use N/C/P ratio to manage sources of Carbon / Amino acid and control their influence on bacteria and corals in reef...

    $59.00
    Add to Cart
  • Neptune Systems SV1 Solenoid Valve Neptune Systems SV1 Solenoid Valve Neptune Systems SV1 Solenoid Valve Neptune Systems SV1 Solenoid Valve

    Neptune Systems

    Neptune Systems SV1 Solenoid Valve

    Neptune Systems SV1 Solenoid Valve Perfect for controlling your RODI system, top off system, calcium reactor, or other low flow items that use 1/4" tubing. The solenoid valves uses the 24V accessory port found on 1Link modules and the EnergyBar 832...

    $49.99
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  • Pinpoint pH Probe, Double Junction, Lab Grade

    Pinpoint - American Marine

    Pinpoint pH Probe, Double Junction, Lab Grade

    Pinpoint pH Probe, Double Junction, Lab Grade Replacement pH probe for Pinpoint pH monitors and controllers. Pinpoint pH Probe. Replacement pH probe for Pinpoint pH monitors and controllers. Product code: 1307Item No. TE-AMPP-01050

    $49.99
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  • HYDROS Skimmer Sensor HYDROS Skimmer Sensor HYDROS Skimmer Sensor HYDROS Skimmer Sensor HYDROS Skimmer Sensor

    HYDROS

    HYDROS Skimmer Sensor

    HYDROS Skimmer Sensor The HYDROS Skimmer Sensor serves a very specific and important role: it prevents your protein skimmer from overflowing onto the floor or back into your sump. The way it works is easy: just place the sensor inside any protein...

    $48.50
    Add to Cart
  • HYDROS Water Level Sensor HYDROS Water Level Sensor HYDROS Water Level Sensor HYDROS Water Level Sensor

    HYDROS

    HYDROS Water Level Sensor

    HYDROS Water Level Sensor The HYDROS Water Level Sensor is an optical sensor you can use for a variety of aquarium applications, such as sensing when your tank needs to be topped off or to detect when a dosing container needs a refill. It plugs into any...

    $48.50
    Add to Cart
  • API Reef Master Test Kit API Reef Master Test Kit

    API

    API Reef Master Test Kit

    API Master Reef Test KitTo maintain and grow healthy corals, the correct balance of calcium and carbonates is essential, as are low levels of phosphate and nitrate. This kit provides highly accurate testing for each of these critical parameters: ...

    $44.99
    Add to Cart
  • AutoAqua Smart Stir AutoAqua Smart Stir AutoAqua Smart Stir AutoAqua Smart Stir

    AutoAqua

    AutoAqua Smart Stir

    AutoAqua Smart Stir The Auto Aqua Smart Stir makes testing with liquid reagents a fast and effortless process. Just drop the magnetic stirring bar in the testing vial, put it on the stir base, and press the power button. Forget about tediously adding a...

    $41.99
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  • API Freshwater Master Test Kit API Freshwater Master Test Kit

    API

    API Freshwater Master Test Kit

    API Master Freshwater Test Kit This kit tests tap water and aquarium water for five different parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate.  Highly accuate and economical.  Unique,...

    $39.99
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  • API Saltwater Master Test Kit API Saltwater Master Test Kit

    API

    API Saltwater Master Test Kit

    API Master Saltwater Test Kit.A complete kit for testing marine aquarium water. Tests water four ways to protect marine fish and invertebrates from dangerous water conditions. Kit includes tests for: High Range pH, Ammonia, Nitrite, Nitrate, plus four...

    $39.99
    Add to Cart
  • Hanna Salinity Tester Calibration Solution. 25 Sachets Hanna Salinity Tester Calibration Solution. 25 Sachets

    Hanna Instruments

    Hanna Salinity Tester Calibration Solution. 25 Sachets

    Hanna Salinity Tester Calibration Solution. 25 Sachets HI70024P is a premium quality 35.00 ppt salinity calibration solution standardized with a conductivity meter that has been calibrated with  potassium chloride NIST 2202 SRM (Standard Reference...

    $39.99
    Add to Cart
  • Deluxe Salinity Refractometer with ATC Deluxe Salinity Refractometer with ATC Deluxe Salinity Refractometer with ATC

    AquaCave

    Deluxe Salinity Refractometer with ATC

    Deluxe Salinity Refractometer with ATC For the most precise measurement of salinity, the experts use a Refractometer. This high-tech instrument is used to measure salinity when perfect conditions are needed for breeding, or keeping very delicate corals...

    $34.95
    Add to Cart
  • PinPoint Calibration Thermometer

    Pinpoint - American Marine

    PinPoint Calibration Thermometer

    PinPoint Calibration Thermometer American Marine Inc. is proud to introduce the PINPOINT®Calibration Thermometer, the only truly accurate and affordable digital thermometer system with a large range calibration feature and a replaceable probe...

    $34.95
    Add to Cart
  • Ice Cap Magnetic Tubing Holder 4 Port Ice Cap Magnetic Tubing Holder 4 Port Ice Cap Magnetic Tubing Holder 4 Port

    IceCap

    Ice Cap Magnetic Tubing Holder 4 Port

    Ice Cap Magnetic Tubing Holder 4 Port The IceCap magnetic tube holder universally mounts tubing securely to most smooth locations up to 1/2in thick. Also available as a 2-Tube holder and a 4-Probe holder. Magnetic holder can be fixed on the sump or...

    $33.48
    Add to Cart
  • Hanna Copper High Range Checker HC Calibration Check Set Hanna Copper High Range Checker HC Calibration Check Set

    Hanna Instruments

    Hanna Copper High Range Checker HC Calibration Check Set

    Hanna Copper High Range Checker HC Calibration Check Set HI702-11 is a high-quality set of calibration standards that allows users to validate the Copper High Range Checker®HC - HI702. The HI702-11 includes one sealed cuvette for zero ppm copper and...

    $32.99
    Add to Cart
  • Pinpoint Wireless Digital Thermometer

    Pinpoint - American Marine

    Pinpoint Wireless Digital Thermometer

    Pinpoint Wireless Digital Thermometer Utilizing a radio wave signal, the remote sensor(s) will measure the temperature at the waterproof probe tip and send the information to the PINPOINT Temperature Display Monitor, which will display the temperature...

    Was: $37.95
    Now: $32.26
    Sold Out - More on the way
  • Probe Holder Fitting Probe Holder Fitting

    Reef Octopus

    Probe Holder Fitting

    Probe Holder This black nylon compression fitting designed to hold standard pH and ORP probes. Threaded end is 1/2-14 NPT. Includes PVC dummy plug in case probe is unavailable during equipment use. Comonly used for calcium reactors and collection...

    $29.95
    Add to Cart
  • Red Sea KH/Alkalinity Pro Test Refill Red Sea KH/Alkalinity Pro Test Refill

    Red Sea

    Red Sea KH/Alkalinity Pro Test Refill

    Red Sea KH/Alkalinity Pro Test Refill Advanced titration test measuring the level of buffers in your reef aquarium, with exceptionally high accuracy of 0.05 meq/l (0.14 dKH) Red Sea’s KH\ALKALINITY PROReef Test Kit is an advanced titration test,...

    $28.99
    Add to Cart
  • Red Sea Magnesium Pro Test Refill Red Sea Magnesium Pro Test Refill

    Red Sea

    Red Sea Magnesium Pro Test Refill

    Red Sea Magnesium Pro Test Refill Advanced titration test measuring the level of Magnesium in your reef aquarium, with exceptionally high accuracy of 20 ppm  Test Name Element Accuracy Range Test Type No. of test Magnesium...

    $28.99
    Add to Cart
  • Ice Cap Magnetic Probe Holder 4 Port Ice Cap Magnetic Probe Holder 4 Port Ice Cap Magnetic Probe Holder 4 Port

    IceCap

    Ice Cap Magnetic Probe Holder 4 Port

    Ice Cap Magnetic Probe Holder 4 Port A SIMPLE WAY TO ORGANIZE AND MOUNT PROBES The IceCap magnetic probe holder universally mounts tubing securely to most smooth locations up to 1/2in thick. Also available as a 2-Tube holder and a 4-Tube holder...

    Was: $33.48
    Now: $28.70
    Add to Cart
  • Salifert Magnesium Test Kit

    Salifert

    Salifert Magnesium Test Kit

    Salifert Magnesium Aquarium Test KitMagnesium is present in NSW in a fairly high concentration (1300 - 1400 mg/L). Magnesium is an essential part of chlorophyll, which is necessary for photosynthesis. Without photosynthesis plants, including algae...

    $21.49
    Add to Cart
  • Salifert Phosphate Test Kit

    Salifert

    Salifert Phosphate Test Kit

    Salifert Phosphate Aquarium Test KitPhosphate has several negative effects if present in a too high concentration. First of all undesirable algae growth might result. Making an aquarium an unpleasant sight.Phosphate also blocks or retards the growth of...

    $21.49
    Add to Cart
  • Salifert Calcium Test Kit

    Salifert

    Salifert Calcium Test Kit

    Salifert Calcium Test KitCalcium is a major constituent of calcareous algae, skeletal material of hard corals and the skeletal needles of soft/leather corals. Calcium also fulfills many biological functions.Quite often a too low calcium concentration...

    $20.49
    Add to Cart
  • Salifert Potassium Test Kit

    Salifert

    Salifert Potassium Test Kit

    Salifert Potassium Test Kit Potassium concentration in natural seawater is approximately 400 ppm. Many aquarists have reported that a low potassium value reduces colors in corals. This can be corrected by increasing the potassium value to the normal...

    $20.49
    Add to Cart
  • Salifert Flat Worm Exit

    Salifert

    Salifert Flat Worm Exit

    Salifert Flat Worm Exit.Salifert Flatworm Exit is a safe solution to get rid of flatworms in your tank. It is perfectly harmless for the reef inhabitants, both fish and invertebrates, but definitely deadly for the flatworms. Flatworm body juice can...

    $18.49
    Add to Cart
  • Salifert Nitrate Test Kit

    Salifert

    Salifert Nitrate Test Kit

    Salifert Nitrate Aquarium Test KitWhen an aquarium has insufficient regions deprived of oxygen (= anaerobic zones) or denitrification proceeds incompletely then nitrate will build-up.A too high nitrate concentration can result in unwanted algae-growth...

    $18.49
    Add to Cart
  • Salifert KH/Alkalinity Test Kit

    Salifert

    Salifert KH/Alkalinity Test Kit

    Salifert KH/Alkalinity Test KitCalcium alone cannot form the skeletal material of corals and allow calcareous algae to grow. Some other substances are needed as well. A few other constituents are carbonate and bicarbonate. These two substances also...

    $17.49
    Add to Cart
  • API Ammonia Test Kit for Fresh or Saltwater API Ammonia Test Kit for Fresh or Saltwater

    API

    API Ammonia Test Kit for Fresh or Saltwater

    API Test Kit Ammonia for Fresh or Saltwater.Ammonia, constantly released into the aquarium, is the number one killer of tropical fish. Fast, easy and accurate, this test kit measures ammonia levels from 0 to 7 ppm.  API Test Kit Ammonia for Fresh or...

    $15.48
    Add to Cart
120 of 144 Items

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