10 Best Aquarium Thermometer of December 2025

• Stays in place with a unique magnetic fastening system.
• Smarttemp Thermometer
• All items are brand new, never worn and never used. We guarantee the authenticity of all items.

JW Pet

• Fish tank thermometer designed to sink to the bottom
• Remains standing in a vertical position
• Accurate and easy-to-read thermometer
• Provides readings in Fahrenheit and Celsius
• Includes safety zone indicator appropriate for most tropical fish

Marina

• Wide application: Ideal for use in water or high moisture environment like aquarium terrarium, or vivarium; suitable for different water types such as fresh water, tap water, salty water, marine water and etc
• Easy to read: Comes with a large LCD display that is easy to read clearly
• Easy to setup: Submerge probe with suction cup can easily be set in water (Submerge probe only, do not submerge thermometer in water) ; Press ''PWR'' for 3 seconds to power off
• Free extra LR44: 2 PCS LR44 button cell for each thermometer (one for operation, one for spare)
• Wide temperature range: Measure -58°F to +158°F (-50°C to +70°C) with accuracy +/- 1°C

AQUANEAT

• Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water).
• Easy to apply suction cup and easy to read lcd screen; temperature readings to within 1 degree
• Large, easy to read lcd display; compact design for discrete use
• Temperature range -50 degree Celsius ~ + 70 degree Celsius; Operating temperature -10 degree Celsius ~ +50 degree Celsius.
• Powered by one lr44 button cell (included)

Zacro

• Thermometer ideal for use with Fluval EBI Nano Shrimp and Fluval Flora Aquatic Plant Kits
• Temperature range of 35-125 Fahrenheit
• Accurate and easy to read
• Perfect size for your aquarium
• Measures 4 inches tall

Fluval

• Easy-to-read floating thermometer
• Includes a safety zone indicator
• Equipped with suction cups
• Ensures your aquarium is at a proper temperature
• Temperature range of 30 to 120 degrees Fahrenheit

Marina

• Wide application: Ideal for use in water or high moisture environment like aquarium terrarium, or vivarium; suitable for different water types such as fresh water, tap water, salty water, marine water and etc.
• Easy to read: Comes with a large LCD display that is easy to read clearly
• Easy to setup: Submerge probe with suction cup can easily be set in water (Submerge probe only, do not submerge thermometer in water) ; Press ''PWR'' for 3 seconds to power off
• Free extra LR44: 2 PCS LR44 button cell for each thermometer (one for operation, one for spare)
• Wide temperature range: Measure -58°F to +158°F (-50°C to +70°C) with accuracy +/- 1°C

AQUANEAT

• Easy to read floating aquarium thermometer with suction cups
• Includes a safety zone indicator appropriate for most tropical fish
• Equipped with suction cups to attach to the side of your fish tank
• Ensures your aquarium is at the proper temperature
• Thermometer is 4.25 inches tall

Marina

• In-tank thermometer is secured with magnet outside the tank
• No suction cups needed
• Green safe zone indicates optimal temperature range
• Large easy to read numbers

JW Pet

• Easy To Read
• Mounts Vertically On The Outside Of Your Aquarium
• Easily Movable
• Country of Origin: CHINA

LCR Hallcrest