Aquarium Meters & Controllers

2,953 results

RedSea ReefDose 4 Head Doser with Containers
Pre-Owned · Red Sea
$500.00
or Best Offer
$41.70 shipping
Hanna HI713 Phosphate Low Range Checker HC (Saltwater) - Hanna Instruments
Pre-Owned
$33.95
or Best Offer
$7.88 shipping
Hunter WAND Wi-Fi Module Irrigation Controller
Brand New
$85.49
Was: $89.99was - US $89.99
Free shipping
Rain Bird LNK WiFi Module Wireless ESP-TM2 ESP-Me I-Phone Link LNK2WiFi 2nd Gen
Brand New
$89.25
Was: $93.95was - US $93.95
Free shipping
26 inch Hay Probe Bale Sampler, Stainless Steel Hay and Forage Probe for Drill
Brand New · Unbranded
$70.00
or Best Offer
$11.28 shipping
New ListingNeptune Systems A3 Apex Junior
Pre-Owned · Neptune Systems
$159.99
Free shipping
1 Aquarium Fish Tank Thermometer Temp Sticker Stick On **FAHRENHEIT IN BOLD!**
Brand New · Unbranded
$1.99
Free shipping
4,964 sold
Tunze Osmolator 3 Nano
Brand New · Tunze
$129.99
Free shipping
Neptune Systems EB8 Energy Bar
Pre-Owned · Neptune Systems
(2)
$90.00
or Best Offer
Trending at $145.00
$11.07 shipping
Only 1 left!
Used Neptune Systems Apex DOS Dosing Pump And Fluid Metering System Mfg 2021
Pre-Owned · Neptune
$229.99
Free shipping
Only 1 left!
New Listing1 Neptune Systems Apex Fluid Monitoring Module FMM No Mount
Pre-Owned · Neptune Systems
$74.99
Free shipping
New ListingNeptune Systems Apex PM1 pH/ORP Probe Module Black Label
Pre-Owned · Neptune Systems
$69.99
Free shipping
New ListingNeptune Systems Apex A3 Pro Base Unit Only
Pre-Owned · Neptune Systems
$359.99
Free shipping
Neptune Apex Breakout Box DC Jacks w/ 6 cable leads included Hidden Mounting
Brand New
$30.59
Was: $35.99was - US $35.99
or Best Offer
Free shipping
73 sold
Profilux Plus II controller with Salinity Card w/ Power Cord
Pre-Owned
$200.00
Free shipping
Auto Top Off Dual Float Switch Sensor ATO Water Level Controller 4 Reef Aquarium
Brand New
$44.99
Free shipping
48 sold
Aquarium Fish Tank Thermometer Temp Sticker Stick on **FAHRENHEIT IN BOLD!**
Brand New · Unbranded
$1.99 to $4.99
Free shipping
451 sold
New ListingNeptune Systems Apex VDM Module LED & Pump Control Black.
Pre-Owned · Neptune Systems
$69.99
Free shipping
Used Neptune Systems APEX A3 Base Unit.
Pre-Owned · Neptune Systems
$224.99
Free shipping
New ListingNeptune Systems Apex ATK V2 ATO Magnet and Optical Sensor with Float Valve
Pre-Owned · Neptune Systems
$79.99
Free shipping
New ListingNeptune Systems Apex Jr Aqua Controller
Pre-Owned · Neptune Systems
$99.99
Free shipping
Aquarium Digital Thermometer Fish Tank Salt Water Terrarium
Brand New
$6.29 to $16.99
Free shipping
1,416 sold
Dual Fish Tank Aquarium Thermometer Temperature Sticker Celsius Fahrenheit °C
Brand New · Unbranded
$1.95
Free shipping
672 sold
1-3 fish tank aquarium thermometer glass mount suction cup floating temperature
Brand New
$9.99
Free shipping
Apogee Par Meter SQ 420X Model SQ-420X
Pre-Owned
$180.00
Free shipping
New ListingHydros Launch Controller
Pre-Owned
$475.00
or Best Offer
$13.17 shipping
Neptune Systems Apex EL Base Unit w/ Thermometer Temperature & pH Probes
Pre-Owned · Neptune Systems
$199.00
or Best Offer
$21.20 shipping
Milwaukee MC122 pH Controller w/probe
Brand New · Milwaukee
(18)
$174.40
Free shipping
*NEW* AQUATEK Aquarium CO2 Regulator Mini with Integrated COOL TOUCH Solenoid
COOL TOUCH and QUIET OPERATION SOLENOID! ON SALE NOW!!
Brand New · Aquatek
(95)
$45.99
Free shipping
4,213 sold
2xAquarium Digital Thermometer LED Fish Tank Temperature Gauge with Touch Screen
Brand New · Unbranded
$11.45
Was: $12.18was - US $12.18
or Best Offer
Free shipping
123 sold
AquaIllumination AI Hydra Prime 16 HD LED Reef Aquarium Light (Blac
Brand New
$219.25
or Best Offer
$21.93 shipping
13 watching
Neptune Apex Breakout Box Push Terminals Slim Design Hidden Mounting Bracket
Brand New
$23.79
Was: $27.99was - US $27.99
or Best Offer
Free shipping
Apex Neptune Optical Level Sensor W/ Magnetic Mount. Part } OS-1-M. New
Brand New · Neptune
$29.99
Free shipping
Neptune Systems Apex Classic Controller
Pre-Owned · Neptune Systems
$79.99
Free shipping
Only 1 left!
REEFER Skimmer 600 ReefRun DC Pump Upgrade Kit (Excl. controller) - Red Sea
Brand New · Red Sea
$199.00
Free shipping
HM Digital pH Electrode Storage Solution (60cc)
Brand New
(7)
$9.95
Free shipping
Only 3 left
GHL Profilux 4 White,GHL KH Director White, and GHL Doser 2.1 Slave White
Pre-Owned
$250.00
or Best Offer
$10.33 shipping
AQUANEAT 2 Pack Aquarium Thermometer Digital Reptile Fish Tank Water Temperature
Brand New
$8.99
Free shipping
366 sold
Customizable Breakout Box 4x Lighted Toggle 2x Push Button for Apex Neptune
Brand New
$80.74
Was: $94.99was - US $94.99
or Best Offer
$11.95 shipping
9 watching
VBR-Aqua IP68 PAR Meter For Aquariums & Reefs R, G, B PAR Separately
Pre-Owned
$127.90
or Best Offer
Neptune Systems Apex MXM Mobius Wireless Module with AquaBus USB Cable
Pre-Owned · Neptune Systems
$99.99
Free shipping
Used Neptune Systems APEX A2 El Base Unit.
Pre-Owned · Neptune Systems
$159.00
Free shipping
Hydros Sole - Hydros
Brand New
$270.00
or Best Offer
$12.01 shipping
JW Smart Temp Magnet Style Aquarium Thermometer
Brand New · JW Pet
(18)
$7.25
Trending at $7.95
Free shipping
39 sold
Tunze Osmolator 3 Auto Top Off - 3154.000
Brand New · Tunze
$229.99
Free shipping
JW Pet Fusion Smart Temp Non-Standing Magnet Style Aquarium Thermometer
Brand New · JW Pet
(18)
$8.13
Free shipping
390 sold
Hanna Instruments pH, Salinity, and Temperature Monitor - HI981520
Brand New
$220.00
Free shipping
New ListingNeptune Systems Trident Reef Marine Aquarium Water Analyzer w/ 1Link Cable
Pre-Owned · Neptune Systems
$398.00
or Best Offer
$9.39 shipping
Used Neptune Systems Apex Temperature Probe Temp
Pre-Owned · Neptune Systems
$24.99
Free shipping
51 sold
Aquarium Digital Thermometer for Fish Tank Temperature Gauge 1pc
Brand New · Unbranded
$9.81
Free shipping
Only 1 left!
Neptune Systems Apex Trident Marine Aquarium Water Analyzer
Pre-Owned · Neptune Systems
$320.00
$19.99 shipping
23 watching
Neptune Systems Apex Lab Grade Ph And Orp Probe Mfg 2019
Pre-Owned · Neptune Systems
$69.99
Free shipping
9 watching
HANNA HANNA HI9146-04 Smart Buy
Brand New
$199.99
or Best Offer
Free shipping
Only 1 left!
Neptune Apex Optical Level Sensor W/ Magnetic Mount NEW - Neptune Systems
Brand New · Neptune Systems
$25.00
Free shipping
Neptune Systems APEX A3 Pro New Sealed In Box
Brand New · Neptune Systems
$844.99
Free shipping
Neptune Systems Apex DOS Dosing & Fluid Metering System w/ DDR Dosing Reservoir
Pre-Owned · Neptune Systems
$329.99
Free shipping
Duetto 2 Dual-Sensor ATO Aquarium Auto-Top-Off System - XP Aqua
Brand New
$139.99
Free shipping
Only 2 left
HI713-25 Phosphate Low Range Checker Reagent (25 Tests) - Hanna Instruments
Brand New · Hanna
$17.99
$4.99 shipping
222 sold
EXO Auto Top Off ATO - Reef Breeders
Brand New
(2)
$49.99
$4.99 shipping
2x Covered Toggle 4x Push switch Apex Neptune breakout box with 24VDC alarm.
Brand New
$106.25
Was: $125.00was - US $125.00
$10.60 shipping
32 watching

Best selling

See All

Milwaukee Instruments Ph & ORP Controller Mc125
$229.00 New
Aquatek CO2 Mini Aquarium Regulator
(95)
$45.99 New
Seneye Reef Aquarium Monitor and Par Meter
(3)
$195.95 New
$150.00 Used
Milwaukee 716690 PH Controller
(18)
$174.40 New
$60.00 Used
Hanna Instruments Checker Phosphate Colorimeter (HI713)
(3)
$67.99 New
$42.50 Used
SENEYE WEB SERVER (WIFI VERSION but missing wi-fi module) - SENEYE
(1)
$199.99 New
Aquatop Floating Glass Aquarium Thermometer W/ Suction Cup Mount
(12)
$7.95 New
T150 Fully Electronic Aquarium Heater (150 Watt) up to 45 Gallons - Fluval
$40.49 New

Top rated

See All

Milwaukee 716690 PH Controller
(18)

87% agree - Would recommend
$174.40 New
$60.00 Used
Aquatop Floating Glass Aquarium Thermometer W/ Suction Cup Mount
(12)

100% agree - Would recommend
$7.95 New
Coralife 00232 Digital Thermometer
(11)

100% agree - Would recommend
$8.49 New
Aquatek CO2 Mini Aquarium Regulator
(95)

91% agree - Would recommend
$45.99 New
HM Digital Dm-1 In-line Dual TDS Monitor 0-9990 PPM Range 2 Readout Accuracy
(34)

100% agree - Would recommend
$29.99 New
Zoo Med Aquasun Aquarium Timer AA10
(17)

88% agree - Would recommend
$16.61 New
Coralife Energy Savers ACLAF877 Deep Six Hydrometer
(14)

85% agree - Would recommend
$10.99 New

Review highlights

Recommended by our customers

Easy to use, easy to read
By abec_be_rtepmd
I was happy that I got this particular one. It was easy to understand and use. see all reviews
Verified Purchase
Coralife Energy Savers ACLAF877 Deep Six Hydrometer
Timer works fine
By robert463modeltrains
Fairly easy to set, just that the little tabs are REALLY tiny and it's easy to press more than 1 at a time. Aside from t... see all reviews
Verified Purchase
Zoo Med AquaSun Aquarium Timer, New, Free Shipping.
Can't buy China products anymore
By krislewis
Sure I can buy a pH meter from China for 1/2 the price, but the reliability of the electronics, and constant failure of... see all reviews
Verified Purchase
MILWAUKEE- MC122 PH CONTROLLER WITH MOUNTING KIT AND PROBE HOLDER CO2 DOSING
Accurate temperture
By wupt9166
I have 2 of these in use and they operate very well. accurately, stays in place, doesn't fall off and are easy to read. ... see all reviews
Verified Purchase
Coralife Digital Thermometer Good For Terrariums Fresh and Saltwater Aquariums
Great add-on to a standard RO system.
By lian8909-ya3xwc71au
Just installed and added to a brand new "Express Water" RO system. Works great so far. Automatic switch-off function is ... see all reviews
Verified Purchase
HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accur
Fantastic Quality and Reliability
By tobin190
Received item very quick and it was in perfect condition. I’ve been using it for a week now and it has been super easy t... see all reviews
Verified Purchase
**NEW** AQUATEK CO2 Regulator Mini (with Integrated COOL TOUCH Solenoid)

Aquarium Meters & Controllers

Shop by category

2,953 results

RedSea ReefDose 4 Head Doser with Containers

Hanna HI713 Phosphate Low Range Checker HC (Saltwater) - Hanna Instruments

Hunter WAND Wi-Fi Module Irrigation Controller

Rain Bird LNK WiFi Module Wireless ESP-TM2 ESP-Me I-Phone Link LNK2WiFi 2nd Gen

26 inch Hay Probe Bale Sampler, Stainless Steel Hay and Forage Probe for Drill

New ListingNeptune Systems A3 Apex Junior

1 Aquarium Fish Tank Thermometer Temp Sticker Stick On **FAHRENHEIT IN BOLD!**

Tunze Osmolator 3 Nano

Neptune Systems EB8 Energy Bar

Used Neptune Systems Apex DOS Dosing Pump And Fluid Metering System Mfg 2021

New Listing1 Neptune Systems Apex Fluid Monitoring Module FMM No Mount

New ListingNeptune Systems Apex PM1 pH/ORP Probe Module Black Label

New ListingNeptune Systems Apex A3 Pro Base Unit Only

Neptune Apex Breakout Box DC Jacks w/ 6 cable leads included Hidden Mounting

Profilux Plus II controller with Salinity Card w/ Power Cord

Auto Top Off Dual Float Switch Sensor ATO Water Level Controller 4 Reef Aquarium

Aquarium Fish Tank Thermometer Temp Sticker Stick on **FAHRENHEIT IN BOLD!**

New ListingNeptune Systems Apex VDM Module LED & Pump Control Black.

Used Neptune Systems APEX A3 Base Unit.

New ListingNeptune Systems Apex ATK V2 ATO Magnet and Optical Sensor with Float Valve

New ListingNeptune Systems Apex Jr Aqua Controller

Aquarium Digital Thermometer Fish Tank Salt Water Terrarium

Dual Fish Tank Aquarium Thermometer Temperature Sticker Celsius Fahrenheit °C

1-3 fish tank aquarium thermometer glass mount suction cup floating temperature

Apogee Par Meter SQ 420X Model SQ-420X

New ListingHydros Launch Controller

Neptune Systems Apex EL Base Unit w/ Thermometer Temperature & pH Probes

Milwaukee MC122 pH Controller w/probe

*NEW* AQUATEK Aquarium CO2 Regulator Mini with Integrated COOL TOUCH Solenoid

2xAquarium Digital Thermometer LED Fish Tank Temperature Gauge with Touch Screen

AquaIllumination AI Hydra Prime 16 HD LED Reef Aquarium Light (Blac

Neptune Apex Breakout Box Push Terminals Slim Design Hidden Mounting Bracket

Apex Neptune Optical Level Sensor W/ Magnetic Mount. Part } OS-1-M. New

Neptune Systems Apex Classic Controller

REEFER Skimmer 600 ReefRun DC Pump Upgrade Kit (Excl. controller) - Red Sea

HM Digital pH Electrode Storage Solution (60cc)

GHL Profilux 4 White,GHL KH Director White, and GHL Doser 2.1 Slave White

AQUANEAT 2 Pack Aquarium Thermometer Digital Reptile Fish Tank Water Temperature

Customizable Breakout Box 4x Lighted Toggle 2x Push Button for Apex Neptune

VBR-Aqua IP68 PAR Meter For Aquariums & Reefs R, G, B PAR Separately

Neptune Systems Apex MXM Mobius Wireless Module with AquaBus USB Cable

Used Neptune Systems APEX A2 El Base Unit.

Hydros Sole - Hydros

JW Smart Temp Magnet Style Aquarium Thermometer

Tunze Osmolator 3 Auto Top Off - 3154.000

JW Pet Fusion Smart Temp Non-Standing Magnet Style Aquarium Thermometer

Hanna Instruments pH, Salinity, and Temperature Monitor - HI981520

New ListingNeptune Systems Trident Reef Marine Aquarium Water Analyzer w/ 1Link Cable

Used Neptune Systems Apex Temperature Probe Temp

Aquarium Digital Thermometer for Fish Tank Temperature Gauge 1pc

Neptune Systems Apex Trident Marine Aquarium Water Analyzer

Neptune Systems Apex Lab Grade Ph And Orp Probe Mfg 2019

HANNA HANNA HI9146-04 Smart Buy

Neptune Apex Optical Level Sensor W/ Magnetic Mount NEW - Neptune Systems

Neptune Systems APEX A3 Pro New Sealed In Box

Neptune Systems Apex DOS Dosing & Fluid Metering System w/ DDR Dosing Reservoir

Duetto 2 Dual-Sensor ATO Aquarium Auto-Top-Off System - XP Aqua

HI713-25 Phosphate Low Range Checker Reagent (25 Tests) - Hanna Instruments

EXO Auto Top Off ATO - Reef Breeders

2x Covered Toggle 4x Push switch Apex Neptune breakout box with 24VDC alarm.

Best selling

Milwaukee Instruments Ph & ORP Controller Mc125

Aquatek CO2 Mini Aquarium Regulator

Seneye Reef Aquarium Monitor and Par Meter

Milwaukee 716690 PH Controller

Hanna Instruments Checker Phosphate Colorimeter (HI713)

SENEYE WEB SERVER (WIFI VERSION but missing wi-fi module) - SENEYE

Aquatop Floating Glass Aquarium Thermometer W/ Suction Cup Mount

T150 Fully Electronic Aquarium Heater (150 Watt) up to 45 Gallons - Fluval

Top rated

Milwaukee 716690 PH Controller

Aquatop Floating Glass Aquarium Thermometer W/ Suction Cup Mount

Coralife 00232 Digital Thermometer

Aquatek CO2 Mini Aquarium Regulator

HM Digital Dm-1 In-line Dual TDS Monitor 0-9990 PPM Range 2 Readout Accuracy

Zoo Med Aquasun Aquarium Timer AA10

Coralife Energy Savers ACLAF877 Deep Six Hydrometer

1 Aquarium Fish Tank Thermometer Temp Sticker Stick On FAHRENHEIT IN BOLD!

Aquarium Fish Tank Thermometer Temp Sticker Stick on FAHRENHEIT IN BOLD!

NEW AQUATEK Aquarium CO2 Regulator Mini with Integrated COOL TOUCH Solenoid