Best Dissolved Oxygen Meters of 2026

The Apera SX716 DO Meter is designed for easy and accurate measurement of dissolved oxygen levels. Its proprietary polarographic electrode features a calibration sleeve and a replaceable membrane cap, making calibration straightforward for both saturated and zero oxygen. You can rely on automatic adjustments for temperature and salinity, ensuring precise readings regardless of conditions. Plus, the manual compensation for barometric pressure allows you to fine-tune your measurements for altitude. With the ability to store up to 100 data sets, you can easily log and recall your results, enhancing your data tracking experience.

The EZTOCH Dissolved Oxygen Meter is a handy tool for checking oxygen levels in water. It offers two units for measurement, letting you see oxygen content as mg/L or as a percentage, which helps you keep fish tanks and ponds healthy. The 3.6-foot probe cable makes it easy to reach into small ponds or tanks without hassle. You also get calibration and electrolyte solutions plus extra membranes, so you can keep the meter accurate and ready to use. This meter is perfect for monitoring oxygen in aquariums, ponds, and hydroponic systems, helping you maintain a healthy environment for aquatic life and plants.

The GIDIGI DO Meter is designed to make measuring oxygen levels in water easy and reliable. Its long 4.92-foot probe cable lets you test deep water bodies like ponds and rivers without trouble. You can choose between measuring oxygen in mg/L or as a percentage, which is great for different uses such as aquaculture or brewing. The meter also shows the temperature at the same time, helping you get accurate results. Plus, it automatically adjusts for temperature changes, so your readings stay consistent. Calibration is simple with included accessories, saving you from buying extra supplies and reducing maintenance hassle.

The Rowyet DO Meter provides precise and rapid dissolved oxygen readings, ensuring you can monitor water quality wherever you are. If oxygen levels drop below 5.0mg/L, aquatic life faces survival challenges, making this meter essential for aquaculture and ponds. It features an automatic temperature compensation system, which stabilizes your readings across a range of temperatures. The easy-to-read digital display, complete with backlight, allows you to check results even in dim lighting. Plus, the meter conserves battery with an automatic shut-off after 8 minutes of inactivity.

The YINMIK DO Meter is a versatile tool that helps you measure oxygen levels in water with ease. It offers two measurement modes, letting you check oxygen content in mg/L or saturation percentage, which is perfect for monitoring fish tanks or ponds. The meter provides precise readings with a 0.1mg/L resolution, making it reliable for environmental checks and wastewater treatment. Plus, its long 9.84ft probe cable makes testing in outdoor ponds more convenient. You can also control dissolved oxygen in hydroponics or brewing, improving plant health or maintaining beer and wine quality. The device compensates for altitude and salinity for more accurate results and tracks temperature changes to keep readings steady.

The Gain Express DO Meter offers precise dissolved oxygen readings displayed clearly on a large screen, showing oxygen levels, temperature, and barometric pressure—helpful for those working in aquaculture, environmental studies, or industry. It automatically adjusts for temperature changes, ensuring your measurements stay accurate without extra effort. With the ability to store up to 99 readings and a hold function, you can easily review your data whenever needed. Plus, it features a low battery alert and an automatic power-off option to save energy, making it a smart and convenient tool for your dissolved oxygen testing needs.

The GIDIGI DO Tester is a versatile tool for measuring dissolved oxygen levels in various environments. With its dual measurement modes, you can easily check oxygen content in mg/L or as a percentage, ensuring you get accurate readings for your specific needs. The long 3m probe cable allows you to reach deeper water, making it perfect for outdoor use in lakes or ponds. Additionally, the automatic temperature compensation feature helps maintain stable readings, while the Bluetooth app connection enables you to adjust for salinity and altitude, providing even more precise results.

The GISNPA Dissolved Oxygen Meter offers a wide measurement range of 0.0 to 40.0 mg/L, allowing you to test water quality in various settings, from aquariums to industrial sites. Its user-friendly design lets you easily measure and calibrate without removing the electrode cover, saving you time and effort. Thanks to Automatic Temperature Compensation (ATC), you get accurate readings even as water temperatures change between 0-50℃. The clear LCD screen shows results at a glance, and with features like auto power-off and a low battery alert, you can rely on this meter for convenient and efficient use.

The Dewfat DO Meter is designed to help you monitor the oxygen levels in your aquatic environments effectively. With a measurement range of 0.0-40 mg/L and a built-in temperature sensor, it provides accurate readings essential for maintaining a healthy habitat for fish and other aquatic life. The digital display with backlight ensures that you can easily read the data, even in low light conditions. Additionally, the meter features auto power-off and low battery indicators, making it user-friendly and convenient for regular use.

The DFROBOT Gravity Oxygen Sensor is designed to help you easily measure the amount of dissolved oxygen in water, which is important for checking water quality in places like fish farms and environmental monitoring. The sensor uses a galvanic probe that’s ready to use immediately, so you don’t have to wait to get accurate readings. Its filling solution and membrane cap can be replaced, saving you money on maintenance. The plug-and-play signal converter board works well with Arduino and other systems, making it simple to add the sensor to your projects. Plus, with open-source code and clear tutorials, you’ll find it easy to get started and use this sensor for your water quality tests.