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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.

360 of 502 Items
  • HYDROS Kraken Battery Backup Cable HYDROS Kraken Battery Backup Cable HYDROS Kraken Battery Backup Cable

    HYDROS

    HYDROS Kraken Battery Backup Cable

    HYDROS Kraken Battery Backup Cable This Battery Backup Cable connects the HYDROS Kraken to an external 12V Lead Acid Battery to keep your system alive during power failures. The 6.5ft length total length.

    $40.41
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  • Tropic Marin Hydrometer Tropic Marin Hydrometer Glass Graduated Cylinder With Plastic Hex Base, 500 ml.

    Tropic Marin

    Tropic Marin Hydrometer

    Tropic Marin Hydrometer NOTE: The specific gravity is temperature dependent. With increasing temperature the specific gravity decreases. Therefore, the measured water temperature should be 25 °C / 77 °F to obtain a correct result.For an...

    $40.31
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  • Red Sea ReefSense Leak Detector

    Red Sea

    Red Sea ReefSense Leak Detector

    Red Sea ReefSense Leak Detector Gain ultimate peace of mind with the ReefSense Digital Leak Detector. This highly sensitive, REEF-SPEC sensor connects directly to your ReefControl unit, instantly notifying you and enabling an emergency shutdown of your...

    $40.00
    Sold Out - More on the way
  • 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
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  • 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
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  • HYDROS Flow Sensor 2-inch Union HYDROS Flow Sensor 2-inch Union

    HYDROS

    HYDROS Flow Sensor 2-inch Union

    HYDROS Flow Sensor 2-inch Union Replacement PVC Union (BSPP Pipe Thread to slip) designed for the HYDROS Flow Sensors. Note that this does not feature a US standard NPT thread and is incompatible with items that require one. Available Unions: HYDROS...

    $39.99
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  • Neptune Systems OS1 Optical Sensor - V2

    Neptune Systems

    Neptune Systems OS1 Optical Sensor - V2

    Neptune Systems OS1 Optical Sensor, V2 This sensor plugs into your FMM and, using reflected infrared light, will signal your Apex when it changes state from being wet to dry or dry to wet. This sensor can be used for constructing your own ATO...

    $39.99
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  • Sea Side Aquatics Magnetic Float Switch Sea Side Aquatics Magnetic Float Switch Sea Side Aquatics Magnetic Float Switch Sea Side Aquatics Magnetic Float Switch

    Seaside

    Sea Side Aquatics Magnetic Float Switch

    Sea Side Aquatics Magnetic Float Switch Magnetic Float Switch Sensor Super strong magnet accommodates glass up to 3/4" thick  Sea Side Aquatics Magnetic Float Switch Magnetic Float Switch Sensor Super strong magnet accommodates glass up to...

    $39.95
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  • HYDROS Float Switch Sensor with Magnetic Mount HYDROS Float Switch Sensor with Magnetic Mount HYDROS Float Switch Sensor with Magnetic Mount

    HYDROS

    HYDROS Float Switch Sensor with Magnetic Mount

    HYDROS Float Switch Sensor with Magnetic Mount The HYDROS Magnetic Float Switch Sensor is a simple yet effective water level sensor that can be added to any HYDROS Control with an available Sense Port. This Float Sensor can trigger actions such as...

    $35.79
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  • HYDROS Rope Leak Sensor Extension Cable HYDROS Rope Leak Sensor Extension Cable HYDROS Rope Leak Sensor Extension Cable

    HYDROS

    HYDROS Rope Leak Sensor Extension Cable

    HYDROS Rope Leak Sensor Extension Cable Extend to your HYDROS Rope Leak Sense Port Accessory The HYDROS Rope Leak Detection Sensor is a flexible line that detects the presence of moisture anywhere along the rope. Can sense when freshwater or saltwater...

    $35.79
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  • Tropic Marin ICP Water Analyses - 1 Pack Tropic Marin ICP Water Analyses - 1 Pack

    Tropic Marin

    Tropic Marin ICP Water Analyses - 1 Pack

    Tropic Marin ICP Water Analyses - 1 Pack Description Professional ICP seawater laboratory analysis - ICP-OES is used to analyze over 35 chemical elements in the seawater sample.After the measurement, the user can call up the detailed analysis report...

    $35.18
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  • Fragtags Parwise Essential Kit Fragtags Parwise Essential Kit Fragtags Parwise Essential Kit Fragtags Parwise Essential Kit Fragtags Parwise Essential Kit

    Seneye

    Fragtags Parwise Essential Kit

    Fragtags Parwise Essential Kit The Fragtags Parwise Essential Kit securely holds the light meter while taking readings throughout the tank without disturbing your coral and fish. Also includes a clip-on eye protector for traveling and storage. ITC...

    $34.99
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  • Red Sea Nitrate Pro Test Kit - Reagent Refill Kit Red Sea Nitrate Pro Test Kit - Reagent Refill Kit

    Red Sea

    Red Sea Nitrate Pro Test Kit - Reagent Refill Kit

    Red Sea Nitrate Pro Test Kit - Reagent Refill Kit ADVANCED COLORIMETRIC TEST WITH COMPARATOR, MEASURING THE LEVEL OF NITRATE IN YOUR REEF AQUARIUM, WITH EXCEPTIONALLY HIGH ACCURACY OF 0.12PPM NO3 Red Sea’s Nitrate Pro Reef Test Kit is an advanced...

    $34.99
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  • 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
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  • 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
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  • 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
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  • 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
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  • 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
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  • Seneye Float Seneye Float Seneye Float Seneye Float Seneye Float

    Seneye

    Seneye Float

    Seneye Float This seneye Float allows for the any seneye device to be floated in a pond, aquarium or sump. The seneye float offers flexibility for those who do not wish to use the sucker to attach the seneye device or if you want to get direct...

    $31.49
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  • Red Sea MCP Magnesium Test Kit - 75 Tests Red Sea MCP Magnesium Test Kit - 75 Tests

    Red Sea

    Red Sea MCP Magnesium Test Kit - 75 Tests

    Red Sea MCP Magnesium Test Kit - 75 Tests Red Sea’s user-friendly Magnesium titration test provides a quick and reliable measurement of Magnesium in your aquarium to an accuracy of either 50ppm or 100ppm according to your needs. Kit includes easy to...

    $30.99
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  • HYDROS DC Micro Pump HYDROS DC Micro Pump HYDROS DC Micro Pump HYDROS DC Micro Pump HYDROS DC Micro Pump

    HYDROS

    HYDROS DC Micro Pump

    HYDROS DC Micro Pump With a HYDROS DC Micro Pump and a HYDROS Optical Water Level Sensor (or Float Sensor), you can use the HYDROS Control 2 and Control 4 as an auto top-off (ATO) system. Just plug the pump into a Drive Port and the...

    $30.02
    Add to Cart
  • HYDROS DC Solenoid Water Valve HYDROS DC Solenoid Water Valve HYDROS DC Solenoid Water Valve HYDROS DC Solenoid Water Valve

    HYDROS

    HYDROS DC Solenoid Water Valve

    HYDROS DC Solenoid Water Valve The HYDROS DC Solenoid Valve is a handy HYDROS Control 2 and Control 4 accessory that provides easy on/off RO or RO/DI water flow. You can connect the solenoid to your reverse osmosis filter and use it...

    $30.02
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  • HYDROS IceCap Battery Backup Cable Kit HYDROS IceCap Battery Backup Cable Kit

    HYDROS

    HYDROS IceCap Battery Backup Cable Kit

    HYDROS IceCap Battery Backup Cable Kit This cable kit allows you to connect your HYDROS WaveEngine to the IceCap Battery Backup V3.  Connection is simple: Connect the HYDROS WaveEngine Power Supply to the battery kit cable with the female 4-pin GX12...

    $30.02
    Add to Cart
  • HYDROS Magnet Mount Temperature Sensor HYDROS Magnet Mount Temperature Sensor HYDROS Magnet Mount Temperature Sensor

    HYDROS

    HYDROS Magnet Mount Temperature Sensor

    HYDROS Magnet Mount Temperature Sensor The HYDROS Temperature Sensor is an easy and affordable way to prevent your aquarium water from becoming too cold or too hot. It monitors the water temperature in your aquarium so you can keep it within the safe...

    $30.02
    Add to Cart
  • HYDROS Slim Temperature Sensor Probe HYDROS Slim Temperature Sensor Probe

    HYDROS

    HYDROS Slim Temperature Sensor Probe

    HYDROS Slim Temperature Sensor Probe The HYDROS Slim Temperature Sensor Probe is only 1.6” long and 0.32” wide. It’s all-black solid waterproof IP68 construction is built for years of reliable service. It is a “set it...

    $30.02
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  • HYDROS System Command Bus Cable 25 ft. (DATA ONLY)

    HYDROS

    HYDROS System Command Bus Cable 25 ft. (DATA ONLY)

    HYDROS System Command Bus Cable 25 ft. (DATA ONLY) CoralVue HYDROS 5PIN System Command Bus Cable (DATA ONLY) This HYDROS System Command Bus DATA ONLY Cable allows HYDROS devices to communicate. This is a DATA ONLY cable that cannot supply power from...

    $30.02
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  • Neptune Systems DC24 Extension Cable - 10 ft.

    Neptune Systems

    Neptune Systems DC24 Extension Cable - 10 ft.

    Neptune Systems DC24 Extension Cable - 10 ft. This is a ten foot Male/Female extension cable that will enable you to remotely locate DC24 accessories like the PMUP. The DC24 cable is a product in the Neptune Apex AquaController System line and is...

    $29.99
    Add to Cart
  • Neptune Systems Flow Sensor - 1/4" - FS25 Neptune Systems Flow Sensor - 1/4" - FS25 Neptune Systems Flow Sensor - 1/4" - FS25

    Neptune Systems

    Neptune Systems Flow Sensor - 1/4" - FS25

    Neptune Systems Flow Sensor - 1/4" - FS25 Usually used with aquarium accessories like RODI inputs, calcium reactor feed lines etc., this flow sensor can be placed in line with the flow on 1/4″ tubing, connected to the FMM, and...

    $29.99
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  • 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
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  • PINPOINT 15' ext. Cable for pH or ORP Probe PINPOINT 15' ext. Cable for pH or ORP Probe

    Pinpoint - American Marine

    PINPOINT 15' ext. Cable for pH or ORP Probe

    PINPOINT 15' ext. Cable for pH or ORP Probe  PINPOINT 15 foot extension cable for the pH or the ORP/Probe. This will add an additional 15 feet onto the 10 feet of the probe cable for a total of 25 feet. This extension cable will fit any...

    $29.95
    Add to Cart
  • Hanna HI783-11 Marine Magnesium Certified Standard Kit Hanna HI783-11 Marine Magnesium Certified Standard Kit

    Hanna Instruments

    Hanna HI783-11 Marine Magnesium Certified Standard Kit

    Hanna HI783-11 Marine Magnesium Certified Standard Kit The HI783-11 Marine Magnesium Certified Standard Kit is used to validate the performance of the HI783 Marine Magnesium Checker HC. The kit includes one sealed cuvette with a zero-magnesium value and...

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

    Red Sea

    Red Sea Calcium Pro Test Refill

    Red Sea Calcium Pro Test Refill Features Refill contains all reagents used in the Red Sea calcium test kit Calcium, an essential component in the building of coral skeletons, is constantly depleted from the aquarium and needs to be monitored on a...

    $28.99
    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
  • HYDROS Control Power Supply

    HYDROS

    HYDROS Control Power Supply

    HYDROS Control Power Supply Allows you to power the HYDROS Control.   This power adapter is NOT compatible with the HYDROS WaveEngine or the IceCap Dual Pump Controller. This version comes with a HYDROS Terminator already installed.  This is...

    $28.86
    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
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  • Hanna Glass Cuvette with Cap (2 pieces)

    Hanna Instruments

    Hanna Glass Cuvette with Cap (2 pieces)

    Hanna Glass Cuvette with Cap (2 pieces) The HI731360 is a replacement glass cuvette, with a cap, for use with the HI977 series of portable photometers. 2 pieces Cuvette and cap Optically clear glass

    $27.99
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  • Vivid Creative Salinity Probe Stability Kit Vivid Creative Salinity Probe Stability Kit Vivid Creative Salinity Probe Stability Kit

    VCA

    Vivid Creative Salinity Probe Stability Kit

    Vivid Creative Salinity Probe Stability Kit Kit Includes: Salinity Probe Stability Assembly 36in of 1/4in supply-line hose SICCE Micra compatible Pump adapter for 1/4in RO Line.    Important Installation notes Must be supplied constant 60 to...

    $27.95
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  • Red Sea MCP Ammonia Test Kit

    Red Sea

    Red Sea MCP Ammonia Test Kit

    Red Sea MCP Ammonia Test Kit This advanced colorimetric test has been redeveloped to measure the total ammonia (NH3/NH4) in marine aquariums to an accuracy of 0.15ppm.Red Sea MCP Ammonia Test KitThis advanced colorimetric test has been redeveloped...

    $26.99
    Add to Cart
  • Ice Cap Magnetic Tubing Holder 2 Port Ice Cap Magnetic Tubing Holder 2 Port

    IceCap

    Ice Cap Magnetic Tubing Holder 2 Port

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

    $26.55
    Add to Cart
  • Seneye Cleaner Seneye Cleaner

    Seneye

    Seneye Cleaner

    Seneye Cleaner This seneye cleaner replenishes old and tired looking kit to make it look like new. It is capable of removing even the hardest coralline algae and the hard mineral cake that can build up on kit. Using seneye cleaner is easy, just empty...

    $26.24
    Add to Cart
  • Seneye USB Extension Accessory (2.5m ) Seneye USB Extension Accessory (2.5m ) Seneye USB Extension Accessory (2.5m )

    Seneye

    Seneye USB Extension Accessory (2.5m )

    Seneye USB Extension Accessory (2.5m ) Now you can connect your seneye device to your PC, or power adaptor, up to 5m from your aquarium and enjoy error-free data transmissions. The Hi-Speed USB 2.0 Extension Cable helps you achieve maximum performance...

    $26.24
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360 of 502 Items

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