(1) - Temperature Measurement Range: - 50 to 70℃. (2) - This LCD digital Thermometer has a 1.5m long probe, which can test temperature of some special places, it was widely used in Aquarium, Poultry, Reptile, Incubator, Greenhouse and etc. (3) - LCD displays temperature at the same time. Aquarium thermometers are a small but essential item for your aquarium. Although the tank may look fine, changing or unsuitable water temperature can have a negative effect on both fish and plants. ... Record temperatures regularly to ensure the aquarium water temperature is stable and in the optimal range for your fish.