Meters & Controllers

Aquarium water controllers, thermometers, salinity and pH monitors, probes, and other aquarium meters and controllers on sale here.
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HM Digital PH-80 Meter, factory calibrated moderately priced. FREE Shipping! Buy Now »
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HM Digital PH-80 Meter, factory calibrated moderately priced. FREE Shipping!

Buy: $65.99 Ships:
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$65.99
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5 mins
HM Digital SP-P2 Replacement PH Sensor for PH-200 Buy Now »
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HM Digital SP-P2 Replacement PH Sensor for PH-200

Buy: $14.24 Ships:
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$14.24
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38 mins
Stick On Thermometer Self Adhesive Thermal Strip FREE USA SHIPPING! Buy Now »
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Stick On Thermometer Self Adhesive Thermal Strip FREE USA SHIPPING!

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$4.41
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1 hr
18 mins
HM Digital SP-P2 Replacement PH Sensor for PH-200 New Buy Now »
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HM Digital SP-P2 Replacement PH Sensor for PH-200 New

Buy: $34.17 Ships:
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$34.17
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1 hr
27 mins
NEW AQUATEK CO2 Paintball Tank CGA 320 Adapter FREE SHIPPING Buy Now »
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NEW AQUATEK CO2 Paintball Tank CGA 320 Adapter FREE SHIPPING

Buy: $19.44 Ships:
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$19.44
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1 hr
38 mins
Neptune Systems - AFS Automatic Feeder System for Apex - Aquarium Feeding Feed Bid Now »
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Neptune Systems - AFS Automatic Feeder System for Apex - Aquarium Feeding Feed

Bid: $54.50
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Free
$54.50
1 hr
51 mins
Marina Aquarium Floating Thermometer Fresh Or Salt Suction Cup Buy Now »
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Marina Aquarium Floating Thermometer Fresh Or Salt Suction Cup

Buy: $9.50 Ships:
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$9.50
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3 hrs
31 mins
3 Bulk Reef Supply Doser Pumps Saltwater Reef Marine BRS Dosing with timer Buy Now »

3 Bulk Reef Supply Doser Pumps Saltwater Reef Marine BRS Dosing with timer

Buy: $79.99 Ships:
$29.99
$109.98
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4 hrs
53 mins
NEPTUNE SYSTEMS REPLACEMENT DŌS HEAD CAP - DOS-HEADCAP Buy Now »

NEPTUNE SYSTEMS REPLACEMENT DŌS HEAD CAP - DOS-HEADCAP

Buy: $29.95 Ships:
$6.99
$36.94
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5 hrs
22 mins
HM Digital PH-200 Waterproof Meter, factory calibrated. FREE Shipping! Buy Now »
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HM Digital PH-200 Waterproof Meter, factory calibrated. FREE Shipping!

Buy: $99.99 Ships:
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$99.99
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5 hrs
57 mins
Red Sea Seawater REFRACTOMETER  - precise salt level testing. Buy Now »

Red Sea Seawater REFRACTOMETER - precise salt level testing.

Buy: $59.99 Ships:
$5.99
$65.98
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6 hrs
26 mins
Neptune Systems Apex Advanced Leak Detection Module (ALD) Buy Now »
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Neptune Systems Apex Advanced Leak Detection Module (ALD)

Buy: $84.60 Ships:
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$84.60
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7 hrs
18 mins
**NEW**  AQUATEK CO2 Regulator Mini (with Integrated COOL TOUCH Solenoid) Buy Now »
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**NEW** AQUATEK CO2 Regulator Mini (with Integrated COOL TOUCH Solenoid)

JULY 4TH SALE! EXTRA $63 OFF! FREE GIFT & SHIPPING
Buy: $76.99 Ships:
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$76.99
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7 hrs
21 mins
6 pcs Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black Buy Now »
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6 pcs Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black

Buy: $17.69 Ships:
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$17.69
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7 hrs
30 mins
CO2 Pressure Regulator System - Magnetic Solenoid Bubble Counter CHECK VALVE Bid Now »
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CO2 Pressure Regulator System - Magnetic Solenoid Bubble Counter CHECK VALVE

Bid: $142.89
Ships:
Free
$142.89
8 hrs
43 mins
New Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black Buy Now »
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New Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black

Buy: $4.38 Ships:
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$4.38
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9 hrs
10 mins
3 pcs Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black Buy Now »
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3 pcs Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black

Buy: $8.89 Ships:
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$8.89
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9 hrs
10 mins
New Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black Buy Now »
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New Digital LCD Fish Tank Aquarium Marine Water Thermometer Temperature Black

Buy: $4.59 Ships:
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$4.59
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10 hrs
42 mins
Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.) by Buy Now »
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Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.) by

Buy: $25.24 Ships:
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$25.24
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12 hrs
6 mins
Marina Thermometer Suction Cup Small 2-Pack Marina, New Buy Now »
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Marina Thermometer Suction Cup Small 2-Pack Marina, New

Buy: $5.54 Ships:
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$5.54
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14 hrs
11 mins
Neptune Systems AquaController Apex I/O Breakout Box, New, Free Shipping Buy Now »
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Neptune Systems AquaController Apex I/O Breakout Box, New, Free Shipping

Buy: $50.32 Ships:
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$50.32
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14 hrs
46 mins
Digital LCD Thermometer Temperature For Home Brew Brewing Wine Beer Spirits Buy Now »
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Digital LCD Thermometer Temperature For Home Brew Brewing Wine Beer Spirits

Buy: $7.86 Ships:
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$7.86
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15 hrs
11 mins
Neptune Systems Apex Temperature Probe Extended Life FREE USA SHIPPING! Buy Now »
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Neptune Systems Apex Temperature Probe Extended Life FREE USA SHIPPING!

Buy: $39.94 Ships:
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$39.94
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15 hrs
12 mins
Ista Co2 Indicator monitor the CO2 level in your tank from any angle Buy Now »
Free Shipping

Ista Co2 Indicator monitor the CO2 level in your tank from any angle

Buy: $18.87 Ships:
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$18.87
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15 hrs
49 mins
ISTA CO2 Supply 88g Disposable Cylinder Cartridge Buy Now »
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ISTA CO2 Supply 88g Disposable Cylinder Cartridge

Buy: $17.45 Ships:
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$17.45
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16 hrs
4 mins
Brand New Coralife Digital Power Center 24/7 Digital Timer 05152 Free Shipping Buy Now »
Free Shipping

Brand New Coralife Digital Power Center 24/7 Digital Timer 05152 Free Shipping

Buy: $23.39 Ships:
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$23.39
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16 hrs
19 mins
NEPTUNE SYSTEMS APEX LSM LUNAR 5-LED STRING FOR USE WITH LSM MODULES Buy Now »

NEPTUNE SYSTEMS APEX LSM LUNAR 5-LED STRING FOR USE WITH LSM MODULES

Buy: $59.95 Ships:
$6.99
$66.94
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16 hrs
26 mins
 Ice Cap Gyre Interface Module Apex Ready - FREE USA SHIPPING!! Buy Now »

Ice Cap Gyre Interface Module Apex Ready - FREE USA SHIPPING!!

Buy: $126.95 Ships:
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$126.95
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16 hrs
29 mins
Black Aquarium Thermometer Digital Temperature Gauge Submersible Probe Buy Now »
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Black Aquarium Thermometer Digital Temperature Gauge Submersible Probe

Buy: $10.99 Ships:
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$10.99
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16 hrs
29 mins
Digital Water Thermometer Temperature Control Fish Tank Aquarium Marine 2 Pack Buy Now »
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Digital Water Thermometer Temperature Control Fish Tank Aquarium Marine 2 Pack

Buy: $16.90 Ships:
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$16.90
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16 hrs
44 mins
NEPTUNE SYSTEMS APEX AFS-110 AUTOMATIC FEEDING SYSTEM FOR APEX APEX LITE APEX JR Buy Now »

NEPTUNE SYSTEMS APEX AFS-110 AUTOMATIC FEEDING SYSTEM FOR APEX APEX LITE APEX JR

Buy: $99.95 Ships:
$6.99
$106.94
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16 hrs
50 mins
NEPTUNE SYSTEMS CD PELLET FOOD - CROSSOVER DIET PELLET FOOD Buy Now »

NEPTUNE SYSTEMS CD PELLET FOOD - CROSSOVER DIET PELLET FOOD

Buy: $12.95 Ships:
$6.99
$19.94
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17 hrs
12 mins
NEPTUNE SYSTEMS ADM APEX SILVER DISPLAY MODULE AQUARIUM CONTROLLER Buy Now »
Free Shipping

NEPTUNE SYSTEMS ADM APEX SILVER DISPLAY MODULE AQUARIUM CONTROLLER

AUTHORIZED DEALER - FULL WARRANTY - FAST FREE SHIPPING
Buy: $99.95 Ships:
Free
$99.95
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17 hrs
17 mins
CO2 Indicator Drop Checker LONG TERM MONITOR Test - Real Time Solution Kits Buy Now »
Free Shipping

CO2 Indicator Drop Checker LONG TERM MONITOR Test - Real Time Solution Kits

Buy: $14.79 Ships:
Free
$14.79
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17 hrs
54 mins
1" ID by 1-1/4" OD clear aquarium tubing sold per 1 foot Buy Now »

1" ID by 1-1/4" OD clear aquarium tubing sold per 1 foot

Buy: $2.33 Ships:
$4.99
$7.32
Buy now
17 hrs
57 mins
Apex GOLD Classic Controller with LAB GRADE pH Probe by Neptune Systems Bid Now »

Apex GOLD Classic Controller with LAB GRADE pH Probe by Neptune Systems

Bid: $599.99
Ships:
Based on Zip
$599.99
Plus shipping
18 hrs
8 mins
Milwaukee MC122 pH Smart Controller CO2 Monitor Aquarium Tester w/ Cal. Solution Buy Now »
Free Shipping

Milwaukee MC122 pH Smart Controller CO2 Monitor Aquarium Tester w/ Cal. Solution

Buy: $119.95 Ships:
Free
$119.95
Buy now
18 hrs
26 mins
Industry Park BNC Connecter Electrode PH Probe Sensor Aquarium Hydroponic Lab Co Buy Now »
Free Shipping

Industry Park BNC Connecter Electrode PH Probe Sensor Aquarium Hydroponic Lab Co

Buy: $11.77 Ships:
Free
$11.77
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18 hrs
31 mins
JBJ ATO Automatic Top Off Replacement Float Sensor Switch Fish Tank Buy Now »
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JBJ ATO Automatic Top Off Replacement Float Sensor Switch Fish Tank

Buy: $19.98 Ships:
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$19.98
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18 hrs
38 mins
Lunar Simulator Module: LSM for Apex Controller + 4 LED lights Neptune Systems Bid Now »

Lunar Simulator Module: LSM for Apex Controller + 4 LED lights Neptune Systems

Bid: $89.99
Ships:
Based on Zip
$89.99
Plus shipping
18 hrs
50 mins
VorTech Wireless Module: WXM for Apex System by Neptune Systems Bid Now »

VorTech Wireless Module: WXM for Apex System by Neptune Systems

Bid: $109.99
Ships:
Based on Zip
$109.99
Plus shipping
18 hrs
56 mins
EcoTech Marine Two RMS XR30 Tank Mount Kit - Ecotech Marine Bid Now »

EcoTech Marine Two RMS XR30 Tank Mount Kit - Ecotech Marine

Bid: $159.99
Ships:
Based on Zip
$159.99
Plus shipping
19 hrs
2 mins
MILWAUKEE 7.01 pH CALIBRATION FLUID 20ML SINGLE USE PACKET - APEX REEF KEEPER Buy Now »

MILWAUKEE 7.01 pH CALIBRATION FLUID 20ML SINGLE USE PACKET - APEX REEF KEEPER

Buy: $1.29 Ships:
$3.99
$5.28
Buy now
19 hrs
8 mins
MILWAUKEE 10.01 pH CALIBRATION FLUID 20ML SINGLE USE PACKET - APEX REEF KEEPER Buy Now »

MILWAUKEE 10.01 pH CALIBRATION FLUID 20ML SINGLE USE PACKET - APEX REEF KEEPER

Buy: $1.49 Ships:
$3.99
$5.48
Buy now
19 hrs
9 mins
NEW Salinity Refractometer Seawater Marine Fishkeeping Aquarium Auto Temperature Buy Now »
Free Shipping

NEW Salinity Refractometer Seawater Marine Fishkeeping Aquarium Auto Temperature

Buy: $28.99 Ships:
Free
$28.99
Buy now
19 hrs
25 mins
Milwaukee MP810 pH Dosing pump, Peristaltic Chemical Feeder, 3.8 GPD, 115V Buy Now »

Milwaukee MP810 pH Dosing pump, Peristaltic Chemical Feeder, 3.8 GPD, 115V

Buy: $81.96 Ships:
Based on Zip
$81.96
Plus shipping
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20 hrs
15 mins
Hydra Aquatic Co2 Paintball Adapter Buy Now »
Free Shipping

Hydra Aquatic Co2 Paintball Adapter

Buy: $20.54 Ships:
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$20.54
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20 hrs
16 mins
Aquarium 3 Way Air Line Tube Tee Connector Valve Controls Air Flow 15 Pieces LOT Buy Now »
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Aquarium 3 Way Air Line Tube Tee Connector Valve Controls Air Flow 15 Pieces LOT

Buy: $10.95 Ships:
Free
$10.95
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20 hrs
37 mins
Neptune Apex Aquarium Controller System (2016 model) w/ Wifi + bonus probe rack Bid Now »

Neptune Apex Aquarium Controller System (2016 model) w/ Wifi + bonus probe rack

Bid: $595.00
Ships:
$15.00
$610.00
21 hrs
20 mins
Neptune Apex WXM Module for EcoTech Vortech Pump Control and Radion LED lamp Bid Now »

Neptune Apex WXM Module for EcoTech Vortech Pump Control and Radion LED lamp

Bid: $43.00
Ships:
Based on Zip
$43.00
Plus shipping
21 hrs
37 mins


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