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Aquarium Thermometers & Salinity Refractometers

Having a quality aquarium thermometer is important to anyone keeping fish, as fish require life in an environment that's kept within a specific temperature range. Here you'll find an array of fish tank thermometer options, including submersible thermometer models and those that deliver both internal water and external ambient air temperature. A quality digital aquarium thermometer should be extremely accurate and do a good job of protecting your fish from suffering the ill effects of unhealthy temperature variances.

Other helpful equipment found here on this page include a number of aquarium refractometer (or salinity monitor) units that are essential in keeping track of your aquarium’s dissolved salt level. A saltwater hydrometer is also designed to measure a tank water's specific gravity and salt level, but saltwater refractometers are most accurate. Tools such as thermometers and salinity refractometers/hydrometers are critical in keeping a healthy saltwater tank.

Aqua One Glass Thermometer with Suction Cup

Aqua One Glass Thermometer with Suction Cup $4.95

Aqua One Premium Glass Thermometer with Suction Cup

Aqua One Premium Glass Thermometer with Suction Cup $5.95 Sold Out

Aqua One LCD Electronic Thermometer

Aqua One LCD Electronic Thermometer $16.95

Serenity Digital External Thermometer with Internal Sensor

Serenity Digital External Thermometer with Internal Sensor

Serenity Digital External Thermometer with Internal Sensor $8.95 Sold Out

Aqua One Easy Read Thermometer - Inside Tank

Aqua One Easy Read Thermometer - Inside Tank $15.95

Fluval Flexible Coil Brush Hose Cleaner - Flexi Wire Brush

Fluval Flexible Coil Brush Hose Cleaner - Flexi Wire Brush $9.90

Aqua One Hydrometer with Glass thermometer

Aqua One Hydrometer with Glass thermometer $10.95

Fluval Multi-Chamber Holding Breeding Box - 26cm

Fluval Multi-Chamber Holding Breeding Box - 26cm

Fluval Multi-Chamber Holding Breeding Box - 26cm $36.95

$Red Sea Seawater Refractometer$

Red Sea Seawater Refractometer $130.00

Fluval Multi-Chamber Small Holding Breeding Box - 16.5cm

Fluval Multi-Chamber Small Holding Breeding Box - 16.5cm

Fluval Multi-Chamber Small Holding Breeding Box - 16.5cm $26.95

ADA NA Thermometer 10mm (J-10WH)

ADA NA Thermometer 10mm (J-10WH) $32.20 Sold Out

ADA NA Thermometer 5mm (J-05WH)

ADA NA Thermometer 5mm (J-05WH) $23.70 Sold Out

Fluval 2-in-1 Digital Aquarium Thermometer

Fluval 2-in-1 Digital Aquarium Thermometer $26.95

$Serenity Seawater Refractometer$

Serenity Seawater Refractometer $79.95 Sold Out

Betapet Digital External Thermometer with Internal Temperature Sensor

Betapet Digital External Thermometer with Internal Temperature Sensor $7.95 Sold Out

Serenity Digital In Tank Submersible Thermometer

Serenity Digital In Tank Submersible Thermometer $10.95 Sold Out

Floating Thermometer Sub Hydrometer Floating

Floating Thermometer Sub Hydrometer Floating $9.90 Sold Out

Aquael Thermometer Link - Wi-Fi Temperature

Aquael Thermometer Link - Wi-Fi Temperature

Aquael Thermometer Link - Wi-Fi Temperature $86.66 Sold Out

ADA NA Thermometer 10mm (J-10WH)

ADA NA Thermometer 12mm (J-12WH) $35.60

$D D The Aquarium Solution Seawater Refractometer$

$D D The Aquarium Solution Seawater Refractometer$

D D The Aquarium Solution Seawater Refractometer $89.95 Sold Out

ADA NA Thermometer 8mm (J-08WH)

ADA NA Thermometer 8mm (J-08WH) $25.40

ADA NA Thermometer 6mm (J-06WH)

ADA NA Thermometer 6mm (J-06WH) $23.70 Sold Out

Digital See Through Thermometer with Ambient Temperature

Digital See Through Thermometer with Ambient Temperature $10.95 Sold Out

ADA NA Thermometer 10mm (J-10WH)

ADA NA Thermometer 15mm (J-15WH) $35.60

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