Meters & Controllers

Aquarium water controllers, thermometers, salinity and pH monitors, probes, and other aquarium meters and controllers on sale here.
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API - Freshwater/Saltwater High Range pH Test Kit - 160 Tests Buy Now »

API - Freshwater/Saltwater High Range pH Test Kit - 160 Tests

Buy: $7.18 Ships:
$5.95
$13.13
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29 mins
CO2 Atomizer Diffuser 4 in 1 - Solenoid Regulator plant Buy Now »
Free Shipping

CO2 Atomizer Diffuser 4 in 1 - Solenoid Regulator plant

Buy: $17.89 Ships:
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$17.89
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39 mins
Soft Tube Fixture Holder for Dosing Pump Air Pump 4 Tubes Acrylic Made Buy Now »
Free Shipping

Soft Tube Fixture Holder for Dosing Pump Air Pump 4 Tubes Acrylic Made

Buy: $13.61 Ships:
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$13.61
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46 mins
TUNZE Water Level Osmolator 3152 Automatic Aquarium Water Top Off ATO Bid Now »
Free Shipping

TUNZE Water Level Osmolator 3152 Automatic Aquarium Water Top Off ATO

Bid: $98.99
Ships:
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$98.99
46 mins
Aquarium Floating Thermometer Suction Cup Safe Zone Proper Temperature Indicator Buy Now »
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Aquarium Floating Thermometer Suction Cup Safe Zone Proper Temperature Indicator

Buy: $4.14 Ships:
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$4.14
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1 hr
26 mins
PINPOINT - ORP REDOX 400 CALIBRATION FLUID (3 PACK) Buy Now »
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PINPOINT - ORP REDOX 400 CALIBRATION FLUID (3 PACK)

Buy: $12.79 Ships:
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$12.79
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1 hr
44 mins
Qooltek Digital Thermometer Thermostat Oven thermometer with Probe for Vehicle F Buy Now »
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Qooltek Digital Thermometer Thermostat Oven thermometer with Probe for Vehicle F

Buy: $9.99 Ships:
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$9.99
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1 hr
47 mins
Marina Floating Thermometer with Suction Cup - Free 2 Day Shipping Buy Now »
Free Shipping

Marina Floating Thermometer with Suction Cup - Free 2 Day Shipping

Buy: $4.19 Ships:
Free
$4.19
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1 hr
56 mins
Soft Tube Fixture Holder for Dosing Pump Air Pump (4 Tubes) Acrylic Made Buy Now »
Free Shipping

Soft Tube Fixture Holder for Dosing Pump Air Pump (4 Tubes) Acrylic Made

Buy: $12.49 Ships:
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$12.49
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1 hr
57 mins
Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature Buy Now »
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Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

Buy: $10.90 Ships:
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$10.90
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2 hrs
23 mins
3D Digital Electronic Aquarium Thermometer Tank Temp Meter Buy Now »
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3D Digital Electronic Aquarium Thermometer Tank Temp Meter

Buy: $12.16 Ships:
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$12.16
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2 hrs
46 mins
HM Digital DM-1 Inline Dual TDS Monitor Online RO DI Water Filter ppm Meter 1/4" Buy Now »
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HM Digital DM-1 Inline Dual TDS Monitor Online RO DI Water Filter ppm Meter 1/4"

Buy: $27.95 Ships:
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$27.95
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3 hrs
3 mins
Milwaukee MA911B/2 pH Electrode/Probe/Sensor, BNC, 2 Meter, MA911/MC120/MC122 Buy Now »

Milwaukee MA911B/2 pH Electrode/Probe/Sensor, BNC, 2 Meter, MA911/MC120/MC122

Buy: $35.96 Ships:
$3.99
$39.95
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3 hrs
17 mins
Neptune Systems Apex WAV Pump - Starter Kit - TWO WAVEMAKERS - New stock 2017 Buy Now »
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Neptune Systems Apex WAV Pump - Starter Kit - TWO WAVEMAKERS - New stock 2017

Buy: $499.93 Ships:
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$499.93
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3 hrs
26 mins
Auto Water Filler, Top Off System, Aquarium ATO Sytem, Water Level Controller Buy Now »
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Auto Water Filler, Top Off System, Aquarium ATO Sytem, Water Level Controller

Buy: $34.55 Ships:
Free
$34.55
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4 hrs
56 mins
Fish Tank Meter Temp Digital Aquarium Thermometer Water Terrarium Temperature Buy Now »
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Fish Tank Meter Temp Digital Aquarium Thermometer Water Terrarium Temperature

Buy: $14.99 Ships:
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$14.99
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5 hrs
33 mins
Zoo Med industrial mag clip Bid Now »

Zoo Med industrial mag clip

Bid: $6.39
Ships:
$8.95
$15.34
5 hrs
36 mins
6 way Brass CO2 splitter + Bubble Counter & CHECK VALVE Buy Now »
Free Shipping

6 way Brass CO2 splitter + Bubble Counter & CHECK VALVE

Buy: $126.09 Ships:
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$126.09
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5 hrs
40 mins
Apex Neptune Systems Magnetic  Probe Rack Bid Now »

Apex Neptune Systems Magnetic Probe Rack

Bid: $19.50
Ships:
Based on Zip
$19.50
Plus shipping
5 hrs
40 mins
Zoo Med Digital Aquarium Thermometer New Buy Now »
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Zoo Med Digital Aquarium Thermometer New

Buy: $5.89 Ships:
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$5.89
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5 hrs
49 mins
Neptune Apex System Complete Kit Bid Now »
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Neptune Apex System Complete Kit

Bid: $405.00
Ships:
Free
$405.00
5 hrs
54 mins
Equus 6262 Water Temperature Gauge - Black New Buy Now »
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Equus 6262 Water Temperature Gauge - Black New

Buy: $31.89 Ships:
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$31.89
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6 hrs
12 mins
Kent Marine 02120 Hydrometer New Buy Now »
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Kent Marine 02120 Hydrometer New

Buy: $11.59 Ships:
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$11.59
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6 hrs
31 mins
6 pcs LCD Digital Fish Aquarium Thermometer Water Black Free Extra Batteries Buy Now »
Free Shipping

6 pcs LCD Digital Fish Aquarium Thermometer Water Black Free Extra Batteries

Buy: $12.89 Ships:
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$12.89
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6 hrs
49 mins
CNZ Digital LCD Thermometer for Aquarium Fish Tank Vivarium Reptile Terrarium Buy Now »
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CNZ Digital LCD Thermometer for Aquarium Fish Tank Vivarium Reptile Terrarium

Buy: $6.99 Ships:
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$6.99
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6 hrs
57 mins
American Marine PINPOINT ORP/REDOX Probe New Buy Now »
Free Shipping

American Marine PINPOINT ORP/REDOX Probe New

Buy: $62.49 Ships:
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$62.49
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7 hrs
6 mins
UP PH Controller Monitor w/probe electrode BNC Adapter Buffer 100~240V fish tank Bid Now »
Free Shipping

UP PH Controller Monitor w/probe electrode BNC Adapter Buffer 100 ~ 240V fish tank

Bid: $103.99
Ships:
Free
$103.99
7 hrs
34 mins
1-1.07SG ATC Sea Water Aquarium Test Salinity 2 Scales Refractometer Hydrometer Buy Now »
Free Shipping

1-1.07SG ATC Sea Water Aquarium Test Salinity 2 Scales Refractometer Hydrometer

Buy: $16.48 Ships:
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$16.48
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8 hrs
2 mins
Dual Scale 100PPT 1.0 to 1.07SG ATC Salinity Water Aquarium Tester Refractometer Buy Now »
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Dual Scale 100PPT 1.0 to 1.07SG ATC Salinity Water Aquarium Tester Refractometer

Buy: $17.92 Ships:
Free
$17.92
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8 hrs
47 mins
Aquarium CO2 Simple Regulator - Diffuser Adjuster water plant fish tank moss crs Buy Now »
Free Shipping

Aquarium CO2 Simple Regulator - Diffuser Adjuster water plant fish tank moss crs

Buy: $922.97 Ships:
Free
$922.97
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8 hrs
52 mins
3Spiro Glass Co2 Diffuser - Moss Fern Plants Java Valve Fish Tank Planted Buy Now »
Free Shipping

3Spiro Glass Co2 Diffuser - Moss Fern Plants Java Valve Fish Tank Planted

Buy: $17.89 Ships:
Free
$17.89
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9 hrs
1 min
ISTA CO2 Cylinder supporting base fit diameters 65mm~105mm co2 tank aquarium Buy Now »
Free Shipping

ISTA CO2 Cylinder supporting base fit diameters 65mm ~ 105mm co2 tank aquarium

Buy: $14.99 Ships:
Free
$14.99
Buy now
9 hrs
8 mins
Coralife Digital Power Center Timer 8-Outlet Power Strip 4 timer control outlets Buy Now »
Free Shipping

Coralife Digital Power Center Timer 8-Outlet Power Strip 4 timer control outlets

Buy: $34.95 Ships:
Free
$34.95
Buy now
9 hrs
22 mins
Fluval 45 G Pressurized PLANT Co2 Kit 30 gallon 17554 Bid Now »

Fluval 45 G Pressurized PLANT Co2 Kit 30 gallon 17554

Bid: $10.00
Ships:
$4.20
$14.20
9 hrs
34 mins
aquarium CO2 Bubble Counter &CHECK VALVE for Regulator Diffuser Atomizer Reactor Bid Now »
Free Shipping

aquarium CO2 Bubble Counter &CHECK VALVE for Regulator Diffuser Atomizer Reactor

Bid: $4.00
Ships:
Free
$4.00
9 hrs
35 mins
Zacro Pack Of 2 LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Buy Now »
Free Shipping

Zacro Pack Of 2 LCD Digital Aquarium Thermometer Fish Tank Water Terrarium

Buy: $13.28 Ships:
Free
$13.28
Buy now
9 hrs
43 mins
Milwaukee PH56 Waterproof pH/Temp Tester/Meter, Martini, PH52/PH53 Buy Now »
Free Shipping

Milwaukee PH56 Waterproof pH/Temp Tester/Meter, Martini, PH52/PH53

Buy: $69.00 Ships:
Free
$69.00
Buy now
9 hrs
45 mins
1-1.07SG ATC Salt Sea Water Tester Salinity Refractometer Aquarium Hydrometer Buy Now »
Free Shipping

1-1.07SG ATC Salt Sea Water Tester Salinity Refractometer Aquarium Hydrometer

Buy: $16.45 Ships:
Free
$16.45
Buy now
9 hrs
50 mins
Dual Temperature Scales Aquarium Thermometer in Glass Tube with Suction Cup Buy Now »

Dual Temperature Scales Aquarium Thermometer in Glass Tube with Suction Cup

Buy: $4.04 Ships:
Based on Zip
$4.04
Plus shipping
Buy now
9 hrs
53 mins
UP PH Controller Monitor w/probe electrode BNC Adapter Buffer 100~240V #D813 NEW Buy Now »
Free Shipping

UP PH Controller Monitor w/probe electrode BNC Adapter Buffer 100 ~ 240V #D813 NEW

Buy: $94.59 Ships:
Free
$94.59
Buy now
10 hrs
26 mins
Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature Buy Now »
Free Shipping

Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

Buy: $11.02 Ships:
Free
$11.02
Buy now
10 hrs
54 mins
Marina Floating Thermometer with Suction Cup Buy Now »
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Marina Floating Thermometer with Suction Cup

Buy: $4.71 Ships:
Free
$4.71
Buy now
10 hrs
55 mins
Stainless Steel Quick Links,No T7630546,  Apex Products Llc, 3PK Buy Now »
Free Shipping

Stainless Steel Quick Links,No T7630546, Apex Products Llc, 3PK

Great Value, 3 Pack !
Buy: $18.34 Ships:
Free
$18.34
Buy now
11 hrs
25 mins
3X Aquarium Fish LCD Digital Thermometer Water Terrarium Black FREE Batteries Buy Now »
Free Shipping

3X Aquarium Fish LCD Digital Thermometer Water Terrarium Black FREE Batteries

Buy: $7.87 Ships:
Free
$7.87
Buy now
11 hrs
44 mins
American Marine PINPOINT ORP/REDOX Probe Buy Now »
Free Shipping

American Marine PINPOINT ORP/REDOX Probe

Buy: $65.91 Ships:
Free
$65.91
Buy now
12 hrs
16 mins
3 X LCD Digital Aquarium Fish Tank Thermometer Water Terrarium FREE Batteries Buy Now »
Free Shipping

3 X LCD Digital Aquarium Fish Tank Thermometer Water Terrarium FREE Batteries

Buy: $8.98 Ships:
Free
$8.98
Buy now
12 hrs
57 mins
Aquarium Temperature Gauge LCD Thermometer For Fish Tank T110 TPM-10 2m Buy Now »
Free Shipping

Aquarium Temperature Gauge LCD Thermometer For Fish Tank T110 TPM-10 2m

Buy: $4.68 Ships:
Free
$4.68
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13 hrs
1 min
6X LCD Digital Aquarium Fish Thermometer Water Terrarium Yellow FREE Batteries Buy Now »
Free Shipping

6X LCD Digital Aquarium Fish Thermometer Water Terrarium Yellow FREE Batteries

Buy: $14.47 Ships:
Free
$14.47
Buy now
13 hrs
2 mins
? (2-pack, black & yellow) digital fish tank aquarium thermometers 600012 Buy Now »
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? (2-pack, black & yellow) digital fish tank aquarium thermometers 600012

Buy: $13.48 Ships:
Free
$13.48
Buy now
15 hrs
2 mins
NEW ICECAP - DUAL OPTICAL AUTO TOP OFF CONTROLLER - FREE SAME DAY SHIPPING Buy Now »
Free Shipping

NEW ICECAP - DUAL OPTICAL AUTO TOP OFF CONTROLLER - FREE SAME DAY SHIPPING

Buy: $121.99 Ships:
Free
$121.99
Buy now
16 hrs
37 mins


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