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A traditional glass thermometer that floats upright in the water, with a suction cup if you would rather fix it in one place. Reading the water directly rather than through the glass makes it the more trustworthy of the two types — useful when you are commissioning a heater and want to know what the fish are actually experiencing.
Features
- Dual scale — Celsius and Fahrenheit.
- Marked safety zone showing the band that suits most tropical fish.
- Fresh or salt water.
It is glass, and a loose floating thermometer in a tank with large cichlids or a curious turtle will not last. In those tanks fit a stick-on LCD strip instead.