The dissolved oxygen meter has high precision and accurate dissolved oxygen readings and can get test results quickly. The Bluetooth dissolved oxygen meter supports mobile applications, and the Bluetooth data can be transmitted accurately in real time. The measurements of the aquarium water quality test kit are clear at a glance. Allows you to save, manage and share test data at any time. The digital display dissolved oxygen meter uses a mobile phone APP to control the backlight digital display. The digital display of the color difference meter is more clear and easy to read. The dissolved oxygen detection kit can customize its own parameters. The oxygen meter will automatically turn off when not in use for about 8 minutes, and has a low battery alarm function. Measuring range of dissolved oxygen meter: dissolved oxygen: 0.0-40mg/L, dissolved oxygen saturation: 0.0-300.0%, temperature: 0.1-40.0; 32.0-104.0F. The automatic temperature compensation of the dissolved oxygen meter makes the dissolved oxygen test more stable. If the content in water reaches 5.0mg/L, it will be difficult for aquatic organisms to survive. If the dissolved amount is 1-2mg/L and lasts for several hours, it will lead to the death of many aquatic organisms. Therefore, oxygen monitors or dissolved oxygen detection kits are very important for aquaculture, bioreaction and ponds. Dissolved Oxygen Detection Kits can be used to measure and monitor oxygen levels that affect reaction rates, process efficiency, or the environment. Such as aquariums, swimming pools, teaching experiments, sterile laboratory environments, scientific research, environmental testing (lakes, streams, oceans), wastewater treatment, wine production, etc. Color: Black Material: Plastic Package Contents: 1 x Oxygen Gauge Only the above package content, other products are not included. Note: Reflection of light and different monitors may cause the item color in the picture to be slightly different from the real one. The measurement allowable error is +/-1-3cm.