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Features: High-precision Optical Indexing Sensor: Adopts the principle of spectrophotometry, with a wide range of wavelengths for fast and accurate measurement. External Dissolved Oxygen Probe Design: Probe with a sampler to take water samples, without reagents, can be directly measured dissolved oxygen + water temperature. LCD High-Definition Display: 99 sets of data storage, large screen reading more easily, high-definition backlight display key to store data, easy to view comparison. Compact and Protable: Pocket size, DO meter lightweight and easy to move, you can test water anywhere to get the purest water. Wide Application: Suitable for freshwater aquaculture, mariculture, swimming pool, beverage factory, sewage treatment plant, laboratory, etc.