Usage Tips: The dissolved oxygen meter provides high-precision and accurate dissolved oxygen readings, enabling quick test results. The Bluetooth-enabled dissolved oxygen meter supports mobile applications for real-time and accurate data transmission. The aquarium water testing kit displays measured values clearly, allowing users to save, manage, and share test data at any time. The digital display dissolved oxygen meter works with a mobile app to control the backlight digital screen, offering a clearer and easier-to-read display. The colorimeter's digital readout enhances visibility. The dissolved oxygen detection kit allows customization of user-defined parameters. The meter automatically turns off after approximately 8 minutes of inactivity and includes a low battery alert function. Measurement range of the dissolved oxygen meter: - Dissolved oxygen: 0.0–30.0 mg/L - Dissolved oxygen saturation: 0.0–300.0% - Temperature: 0.1–40.0°C (32.0–104.0°F) The device features automatic temperature compensation for more stable dissolved oxygen testing. Dissolved oxygen levels below 5.0 mg/L can make it difficult for aquatic organisms to survive. Prolonged exposure to levels of 1–2 mg/L may result in the death of various aquatic organisms. Therefore, oxygen monitoring or dissolved oxygen testing is essential in aquaculture, biological processes, and pond management. The dissolved oxygen detection kit is suitable for measuring and monitoring oxygen levels that affect reaction rates, process efficiency, or environmental conditions. Applications include aquariums, swimming pools, educational experiments, laboratory sterile environments, scientific research, environmental monitoring (lakes, streams, oceans), wastewater treatment, and wine production. Color: Black Material: Plastic Package Contents: 1 x Oxygen Meter Note: The package includes only the items listed above. Other products are not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is ±1–3 cm.