Aquarium Hydrometers

🔥 Top Aquarium Hydrometers Deals for 2025 you shouldn’t miss!

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$refractometer fishkeeping automatic temperature compensation$

Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation

$17.99

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capetsma salinity hydrometer saltwater freshwater

capetsma Salinity Tester, Accurate Sea Hydrometer Aquarium Marine Salinity Meter for Fish Tank Pond Water Saltwater Freshwater Specific Gravity Test

$9.99

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freshwater saltwater simultaneous aquaponics hydrometer

Aquarium pH Salt Tester, Digital Salinity Meter for Freshwater & Saltwater Fish Tank, Simultaneous display Salt pH TDS for Koi Pond, Reef Tank, Aquaponics PPM pH EC Reader, Hydrometer with S.G. Card

-8% $33.99

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pawfly salinity temperature swimming saltwater

Pawfly pH Pen & ORP Meter, 7 in 1 pH ORP S.G Salinity TDS EC & Temperature Meter, Digital Salinity Tester pH Meter for Swimming Pool Drinking Water Aquarium Hot Tub Saltwater & Spa

$27.99

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gxstwu hygrometer thermometer temperature terrariums

GXSTWU Reptile Hygrometer Thermometer LCD Display Digital Reptile Tank Hygrometer Thermometer with Hook Temperature Humidity Meter Gauge for Reptile Tanks, Terrariums, Vivarium (2 Packs)

-5% $15.99

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boxtech aquarium marine saltwater hydrometer

boxtech Aquarium Marine Test, Sea Saltwater Hydrometer, Reef Ocean Hydrometer Salinity Meter for Pool Aquarium Water Salinity Specific Gravity Test

$9.99

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Pawfly Pool Salt Tester & pH Meter, 5 in 1 pH Salinity TDS EC & Temperature Meter, Digital Salinity Tester TDS Meter for Swimming Pool Drinking Water Aquarium Hot Tub Saltwater & Spa

-7% $23.99

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qianjinl hydrometers hydrometer saltwater rectangle

QIANJINL Salinity Meter Aquarium Hydrometers Salinity Tester Hydrometer Saltwater Aquarium Pool Fish Tank Water Tester Sea Water Salinity Specific Gravity Test(Rectangle)

$9.99

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$salinity refractometer leerchuang scales hydrometer$

Water Salinity Refractometer, LEERCHUANG Dual Scales Hydrometer: Specific Gravity 1.000-1.070 & PPT 0-100 (1‰ = 1ppt = 1000 ppm), Handheld Seawater Tester for Aquarium, Marine Fish-Keeping, Pool Tank

$15.99

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gain express temperature saltwater hydroponics

Digital Salinity & Temperature Meter with ATC, Handheld Pen Type Water Quality Measurement Monitor Tester, 0~70 PPT, for Saltwater, Hydroponics, Pool, Aquarium, Fish Pond, Spa, Monitoring & Testing

$28.90

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$iitrust dog and cat urinary specific gravity refractometer pet supplies dog serum protein sp automatic temperature correction atc cat specific gravity sg included hand held clinic home clinical use cat products cat products black$

iitrust Dog and Cat Urinary Specific Gravity Refractometer, Pet Supplies, Dog Serum Protein/SP, Automatic Temperature Correction, ATC, Cat Specific Gravity/SG Included, Hand Held, Clinic/Home/Clinical Use, Cat Products, Cat Products, Black

$29.93

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Instant Ocean SeaTest Hydrometer

-9% $13.65

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gloglow accurate hydrometer automatic saltwater

GLOGLOW Accurate Hydrometer Salinity Meter, Seawater Hydrometer Accurate Automatic Hydrometer Salt Water Salinity Meter for Aquarium Fish Marine Sea Saltwater

-2% $7.46

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Duo Tetra Works CEA0210 Toto Slim Lipless 50S Raw White

$20.52

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$jeffergrill 3 in 1 clinical refractometer cat dog urine specific serum protein tester equipment$

Jeffergrill 3 in 1 Clinical Refractometer Cat Dog Urine Specific Serum Protein Tester Equipment

$17.86

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topincn saltwater hydrometer salinity automatic

TOPINCN Saltwater Hydrometer Salt Water Salinity Meter Accurate Automatic Hydrometer Salt Water Salinity Meter for Fish

-4% $7.76

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Deals for 2025 you shouldn’t miss!

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$rz refractometer professional monitoring 1 000 1 070$

RZ Aquariums Salinity Refractometer for Seawater Marine Fish-Keeping, Dual Scales Specific Gravity Salinity Meter Hydrometer 0-100ppt & 1.000-1.070, Saltwater Tester with ATC Function

$17.97

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GXSTWU Reptile Hygrometer Thermometer LCD Display Digital Reptile Tank Hygrometer Thermometer with Hook Temperature Humidity Meter Gauge for Reptile Tanks, Terrariums, Vivarium 1pack

$9.99

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aquarium versatile salinity temperature saltwater

Aquarium Salt Tester -Pool Salt Tester, Versatile 5 in1 Salinity, PH, TDS, EC, and Temperature Meter, Digital Salinity Tester for Saltwater Aquarium, Accurate Salinity Meter,Green

$32.99

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$refractometer fishkeeping 1 000 1 070 replacement hydrometer$

Salinity Refractometer for Aquarium Seawater Marine Fishkeeping Salinity Tester 0-100PPT & 1.000-1.070 Salinity Hydrometer Slatwater Refractometer with Automatic Temperature Compensation (ATC)

$16.35

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coralife energy savers aclaf877 hydrometer

Coralife Aquarium Fish Tank Deep Six Hydrometer For Measuring Water Salinity PPT and Specific Gravity

-1% $12.27

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$bowong refractometer temperature compensation 1 000 1 070$

BOWONG Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation

-7% $15.99

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water quality tester high precision measurements

4-in-1 Water Quality Tester - Advanced TDS, PH, Temp, EC Meter - High-Precision Chip & Algorithm for Fast & Accurate Measurements - Ideal for Drinking, Tap, Well, Pool, Aquarium, RO/DI, Hydroponics

$12.99

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POPETPOP Hand Tools Hand Tools Fish Tank Salinity Meter Aquarium Fish Tank Glass Hydrometer: High Precision Salinity Hydrometer Glass Salimeter Sea Water Densitometer for Aquarium Fish Tank Liquid

$17.99

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$refractometer salinometer concentration temperature compensation$

0-100% Salinity Refractometer Handheld Salinometer Sea Water Salt Concentration Tester Meter with Automatic Temperature Compensation for Seawater and Marine Fishkeeping Aquarium

$26.62

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tanita electronic meter drip proof so 302 wh

Tanita Electronic Salt Meter Drip-proof Type White So-302-wh

$58.22

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$autoutlet refractometer clinical measuring veterinary$

AUTOUTLET Refractometer 3-in-1 Animal Clinical Refractometer with ATC Function Measuring Animal's Urine Specific Gravity and Serum Protein for Veterinary and Pet Owner

$17.99

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$toogond professional refractometer saltwater 1 000 1 070$

Professional Salinity Refractometer,Salinity Tester, Salt Tester for Saltwater Pool, for Saltwater Aquarium, Pools, and Tanks,Dual Scale 0-100 PPT & Specific Gravity 1.000-1.070 with ATC Function

$15.99

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balacoo hydrometer precision hydrometer densitometer

balacoo Sea Water Densitometer Brine Hydrometer High Precision Salinity Hydrometer Densitometer for Aquarium Saturated Fish Tank Salinity Meter for Saltwater Aquarium

$25.99

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$salinity refractometer seawater fishkeeping saltwater$

Aichose Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Pool, with ATC Function, Dual Scale: Salinity 0-100‰ and Corresponding Specific Gravity

$19.99

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Digital Salinity Tester for Salt Water - Aquarium Salinity Meter with ATC, IP67 Waterproof, 0-200 PPT Large Range Multi-Parameter Tester for Seawater, Fish Tank, Hydroponics

$27.99

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xisaok aquarium hydrometer thermometer salinity

XISAOK Aquarium Glass Hydrometer with Thermometer Salt Marine Salinity Tester Meter

$4.99

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baixikly Hydrometer Saltwater Aquarium Salinity Tester for Saltwater Aquarium Hydrometer for Testing Salinity and Specific Gravity

$8.59

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$allmeter refractometer 1 000 1 070 monitoring hydrometer$

ALLmeter Salinity Refractometer Saltwater Aquariums Dual Scale 0-100 PPT & Specific Gravity 1.000-1.070 Salinity Tester Meter with ATC Function for Marine Monitoring,Fish Farming,Pool Hydrometer

$17.99

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$salinity refractometer chloride seawater industry$

0-28% Salinity Refractometer ATC, Sodium Chloride (NaCl) Salt Level Meter Tester, Test Kit for Sea Water Brine Seawater Food Industry Pickle Soy Sauce, ±0.2% Accuracy

$21.90

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toddmomy precision salinity hydrometer saltwater

Toddmomy 1 Set High Precision Hydrometer Salt and Brine Hydrometer Glass Saltwater Hydrometer for Pool Aquarium Water

$23.89

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balacoo aquarium glass hydrometer saltwater

balacoo Glass Aquarium Hydrometer - 4 Pcs Fish Tank Hydrometer with Thermometer, Aquarium Glass Fish Tank Float Hydrometer(20 cm)

$22.59

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semetall transparent hydrometer saltwater freshwater

Semetall Salinity Tester Transparent Acrylic Aquarium Sea Hydrometer Salinity Meter Salinity Specific Gravity Test for Fish Tank Pond Water Saltwater Freshwater

$9.99

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$cyclops instruments professional refractometer compensation$

CYCLOPS INSTRUMENTS Professional Salinity Premium Refractometer for Seawater, Marine Fishkeeping Aquarium, Pools, and Tanks, 0-100 PPT Salinity Tester with Automatic Temperature Compensation (ATC)

$23.99

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$abuycs refractometer fishkeeping 1 000 1 070 compensation$

Abuycs Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Tester Hydrometer, Dual Sacle 0-100ppt & 1.000-1.070 Specific Gravity with ATC Automatic Temperature Compensation

$15.99

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