Multifunctional Dissolved Oxygen Tester. This device measures dissolved oxygen (DO) in pools, oceans, aquariums, and more, suitable for both professional and personal use. - Practical operation: No need to open the protective housing; simply submerge the electrode in the water for fast readings. - Construction: Made from high quality materials to enhance durability and reliability, enabling long-term use in a variety of applications, including brewing beer or wine. - Accurate measurements: Features automatic temperature compensation and dual-point calibration to maintain high accuracy under all conditions. - Benefits and compatibility: Versatile for different water types and environments, with a straightforward design that reduces setup time and ensures repeatable results. - Use scenarios: Pool water management; seawater or ocean testing; aquarium upkeep; home brewing or winemaking.