Deep Six Hydrometer

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The newly redesigned Coralife Deep Six Hydrometer delivers precise, reliable measurements of your aquarium’s salinity and specific gravity. Its improved calibration and integrated bubble diffuser ensure consistently accurate readings every time. The built-in base allows the hydrometer to stand securely on any flat surface for easy, hands-free testing, making it the perfect tool for maintaining a healthy marine or reef aquarium environment. TRACK SALINITY to keep your aquarium healthy and stable EASY-TO-READ SCALE with clear, precise markings ACCURATE TO ±0.001 specific gravity units BUBBLE-RESISTANT DESIGN ensures reliable readings CALIBRATED FOR WARM aquariums (68–85 °F / 20–30 °C) Show more