JBL Aquarium Thermometer DigiScan Tube

Convenient and accurate water thermometer that does not interfere with the aquarium, but is attached to a water-carrying hose Easy to install: insert battery (included) & attach with spring clip to hose (e.g. from aquarium filter) Sensitive temperature sensor on the back measures the temperature of the aquarium water via the hose temperature, which is identical to the water temperature Fits all hoses and hose types from 12-26 mm diameter. Also suitable for silicone hoses. Preset alarm for water temperatures below 18 and above 28 °C Package contents: 1 digital aquarium hose thermometer and one LR1130 battery. Dimensions: 5.0 x 3.5 x 1.8 cm