Best Dissolved Oxygen Meters of 2025

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 Extech DO600 Meter is a Dissolved Oxygen Meter that provides accurate measurement of dissolved oxygen in water. It has a temperature range of 0 to 50°C and weighs only 3.8 oz. The DO sensor comes with an easy-to-replace screw-on membrane cap and optional extension cables. The oxygen level is displayed as percent saturation or concentration in mg/L (ppm). The adjustable altitude compensation (0-20,000-Feet in 1,000-Feet increments) and salinity compensation (0 to 50ppt) make it suitable for a variety of applications. The analog bargraph indicates trends, making it easier to read and interpret the results. With the Extech DO600 Meter, you can easily monitor dissolved oxygen levels in aquaculture, environmental monitoring, and water treatment applications.

The UIUZMAR DO Meter is designed for accurate and consistent oxygen readings, thanks to its reinforced polarographic probe and replaceable membrane cap. You will appreciate the convenience of using the accompanying app, which allows you to easily set up salinity and barometric pressure adjustments, and manage your data. Calibration is a breeze with its automatic identification program, making it user-friendly for everyone, even beginners. Additionally, the meter comes with spare components, ensuring long-lasting use without the hassle of running out of supplies.

The YSI DO200 EcoSense DO Meter Kit is a portable device with automatic temperature compensation, manual input for salinity and barometric pressure compensation, and easy-to-replace screw-on cap membranes. It has a dissolved oxygen accuracy of 2% fs and a dissolved oxygen resolution of 0.01 ppm or 10%. This device is perfect for those who need to measure dissolved oxygen levels accurately in the field.

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 UIUZMAR DO Meter is designed to help you monitor oxygen levels in various water environments, ensuring the health of your aquatic life. Its precise measurement capabilities allow you to quickly check dissolved oxygen levels in aquariums, ponds, and aquaculture setups. The portable design features a clear LCD screen, making it easy to read your results. Plus, it includes an accessory kit for regular maintenance, ensuring you always have what you need to keep your meter functioning well. With its wide measuring range, you can efficiently track water quality, making it a valuable tool for any water enthusiast.

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 GISNPA DO Meter is designed for easy and accurate measurement of dissolved oxygen levels. With an extended measurement range of 0.0-40.0 mg/L, you can handle a variety of applications beyond the standard limits. Its user-friendly design allows you to measure and calibrate without removing the electrode cover, making it quick to use. The Automatic Temperature Compensation ensures that readings remain precise across a temperature range of 0-50℃. Additionally, the backlit LCD display makes it simple to read results, while the auto power-off feature helps conserve battery life.

The RCYAGO Dissolved Oxygen Meter is a precision instrument for measuring dissolved oxygen and temperature. It features a polarographic sensor and a thermistor for temperature measurement and compensation. With a digital screen display, it can measure oxygen concentration from 0.0-40.0mg/L, wider than most dissolved oxygen meters on the market. The detachable probe is easy to replace, and it comes with 6 probe protective covers and anaerobic water calibration powder. The meter is suitable for a wide range of applications, including aquariums, swimming pools, and scientific research.

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.