The Aqua One Glass Thermometer measures aquarium water 10°-50°C
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Hydor ETH is the first aquarium heater that works outside of the aquarium tank.
First and unique external heater for aquariums with the exclusive PTC (Positive Thermal Coefficient) technology.
The self-limiting PTC heating element guarantees maximum safety against any risk of overheating.
The exclusive technology and the high quality of the components guarantee a long lasting product.
Suitable for canister filters and sump tanks.