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Specification: Material: Glass Length: Approx. 7.66inch / 19.5cm Bottom diameter: Approx. 0.51inch / 1.3cm Top diameter: Approx. 0.2inch / 0.5cm Features: Easy accurate readings for aquariums. Green color indicates both ideal temperature and salinity. Reads °C and °F Temperature in ¨H(40-100) and ¡æ(0-40). Measure both Temperature and Specific Gravity of the water. Package Included: 1 x Aquarium Thermometer Instruction: Place the hydrometer into water, and let it flow freely in the water. If water level below the green indicator means more fresh water is required. If water level above the green indicator means more salt water is required.