Top 10 Best dissolved oxygen meters and accessories in 2026

Last Updated - 6/27/2026

🏆Best Choice

GIDIGI

Digital Dissolved Oxygen Meter, GIDIGI Dissolved Oxygen Tester with ATC, DO Meter with 9.84ft DO Probe Cable, Dissolved Oxygen Test Kit for Aquarium, Ponds, Fish Tank Range 0.0‑40.0 Mg/L

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•[Portable DO Meter with mg/L and % Modes]: The dissolved oxygen test kit with two modes: mg/L mode (dissolved oxygen content in water, 1mg/L=1ppm) and % mode (saturation percentage). Easily obtain accurate oxygen content in the solution. Professional oxygen monitoring equipment is used in koi ponds, drinking water analysis, home beer and wine brewing, industrial systems, hydroponic nutrient, fish tank, sewage treatment, wastewater treatment, laboratories, education research and other fields.
•[Digital Dissolved Oxygen Meter Kit with 3m Electrode Cable]: GIDIGI dissolved oxygen tester with a 3m electrode cable. With this dissolved oxygen test kit, you can test the oxygen content in deeper water and avoid the problem that the electrode cannot touch the water due to distance. It is very convenient to carry and is very suitable for outdoor water quality measurement and environmental monitoring (lakes, rivers, large ponds and aquaculture and other aquatic systems).
•[Automatic Temperature Compensation and Manual Salinity and Altitude Compensation]: The GIDIGI dissolved oxygen test kit with ATC function, the test values are more stable. By connecting to the phone APP via Bluetooth, you can also set salinity compensation and barometric pressure compensation to obtain more accurate test values. The DO tester is a nice assistant for marine fish and other aquatic life breeding enthusiasts. In addition, through the APP, you can store, manage and share test data
•[Easy to Use and Calibrate]: GIDIGI dissolved oxygen tester comes with detailed instructions and complete accessories (replaceable membrane cap, electrolyte and zero oxygen water). No need to buy calibration solution, easily calibrate the tester. Simple operation, just put the tester electrode into the test solution to quickly obtain accurate oxygen test value. And you can easily get membrane cap and calibration solution by browsing GIDIGI store.
•[GIDIGI Service for Every Customer]: GIDIGI dissolved oxygen meter with digital backlight LCD display, which can easily obtain readings in dim environments, and has data lock function and temperature switching function (℉/℃). GIDIGI support 365-day warranty, so there is no need to hesitate to place an order. If you have any questions, please email us and we will respond to you within 24 hours. We are happy to solve any product problems for you.

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$68.99

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UIUZMAR

UIUZMAR Digital Dissolved Oxygen Meter Portable Dissolved Oxygen Test Kit with 3.6ft Electrode for Ponds Aquarium Aquaculture Do Meter for Water Fish Tank with Measuring Range 0.0‑40.0 Mg/L

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Precise Dissolved Oxygen Meter Kit: Ensure optimal oxygen levels in water with our reliable DO meter kit. It can quickly and accurately check the oxygen level in aquariums, ponds, aquaculture setups, and more, help in keeping a healthy environment for aquatic life.
•Versatile Usage: The UIUZMAR Dissolved Oxygen Meter is suitable for a range of settings, including aquariums, fish tanks, koi ponds, beer brewing, aquaculture, wastewater treatment plants, educational purposes, and various manufacturing applications. It provides precise measurements of dissolved oxygen levels and temperatures in diverse environments.
•Portable Design with Clear LCD Display: Featuring a portable design, the UIUZMAR DO tester comes with a large digital LCD screen and a polarographic probe with a 1.1m cable. Simply insert the probe into the sample for accurate readings displayed on the meter, making it convenient for aquaculture, water analysis, and environmental testing.
•DO Meter with Accessory Kit: The UIUZMAR Dissolved Oxygen Meter Kit includes 6 spare membrane caps for regular maintenance, along with two bottles of electrolyte and a bottle of zero-oxygen calibration solution. Never worry about running out of essential accessories—additional kits are available for purchase from the UIUZMAR store, ensuring a hassle-free shopping experience.
•Wide Measuring Range: The DO meter offers a broad measuring range for dissolved oxygen (0.0-40mg/L), dissolved oxygen saturation (0.0-300.0%), and temperature (0.1-40.0°C; 32.0-104.0°F). Equipped with a built-in temperature sensor and high-precision gold and silver electrodes, the DO probe delivers fast and consistent readings for efficient monitoring of water quality.

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$69.95

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YINMIK

YINMIK Dissolved Oxygen Meter Digital Dissolved Oxygen Test kit for Aquarium Oxygen Tester for Koi Pond Do Meter for Wastewater Smart Dissolved Oxygen Meter with 9.84ft DO Probe Cable for Aquaculture

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•[Professional Dissolved Oxygen Meter]: YINMIK dissolved oxygen tester test oxygen in water by two modes [mg/L mode (dissolved oxygen content in water, 1mg/L=1ppm) and % mode (saturation percentage)]. The DO meter also read temperature for fish tank.
•[Test Accurate Dissolved Oxygen Content in Water]: With a resolution of 0.1mg/L, the digital dissolved oxygen meter provides accurate & consistent DO content readings to work with environmental monitoring and sewage treatment. The extended 9.84ft DO probe cable provides a more convenient test method for outdoor pond monitor.
•[DO Test Kit for Hydroponics and Brewing]: YINMIK dissolved oxygen meter can help hydroponics practitioners accurately control DO, and improve their nutritional value. In addition, for beer & wine brewers, this YK-9100 dissolved oxygen meter can help them maintain the high quality and unique flavor of beer and wine.
•[More DO Value with Salinity & Altitude Compensation]: By inputing altitude & salt compensation in YINMIK APP, YINMIK smart DO meter provides more accurate dissolved oxygen level. And the DO meter is designed with ATC function to prevent temp changes from affecting accuracy of DO test. Moreover, You can store 1,000 data through the APP; and set custom alarms for DO thresholds.
•[Complete YINMIK Dissolved Oxygen Test Kit]: With zero oxygen water, electrolyte, replaceable oxygen permeable membrane & detailed instructions, YINMIK dissolved oxygen tester is suitable for any water, as hydroponics, fish tank, brewing, aquarium or aquaculture, environmental monitoring, educational experiments.

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$65.99

$69.99

-6%

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UIUZMAR

UIUZMAR Zero-Oxygen Solution Electrolytic Solution and Membrane Cap Kit for Dissolved Oxygen Meter 2 Bottles 30ml Electrolyte Solution and 1 Bottle 50ml Zero Oxygen Solution and 6 Membrane Cap

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•[What’s in the Box] You'll get Membrane Cap*6; Electrolyte Solution (30ml) *2; Zero Oxygen Solution (50ml) *1;
•[Zero Calibration is Required for First Use] Zero Oxygen solution helps maintain the accuracy and reliability of dissolved oxygen meter; it’s recommended that zero calibration is required for first use. Calibration ensures accurate readings. This helps keep the DO concentration in check for the health of aquatic life.
•[Improves the Longevity of the Tester] Easy calibration for saturated air (slope calibration) and zero-oxygen (zero calibration) with automatic identify program. Anyone even an amateur can complete the slope calibration easily before each use. UIUZMAR also provide detail user manual and video about how to use and maintain the DO meter.
•[Ensures Accurate Readings] UIUZMAR Dissolved Oxygen Meter using replaceable oxygen-permeable PTFE membrane cap can always give accurate and consistent readings. This semipermeable membrane isolates the sensor elements from the environment but allows oxygen to enter. If any damage is evident (such as wrinkles or tears-holes), the membrane should be replaced.
•[Double Sealed] 2-year expiration from manufacture for an unopened bottle. Store in a cool dry place, away from sunlight.

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$9.95

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Dewfat

Dissolved Oxygen Meter with ATC,0-40.00 mg/L Measurement Range,Dissolved Oxygen Test Kit for Pond Aquarium Aquaculture and Water Fish Tank,DO Meter with Electrode Filling Fluid.

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Dissolved oxygen refers to the concentration of molecular oxygen dissolved in water, generally expressed in mg/L (ppm) and saturation percentage (%), which is the percentage of dissolved oxygen in 1L of water. Dissolved oxygen meter can quickly and accurately check the oxygen level in aquariums, pond, aquaculture setups,and more,help in keeping a healthy environment for aquatic life.
•Measuring Range:Dissolved oxygen meter provides precise measurements of dissolved oxygen levels and temperatures in diverse environments. The dissolved oxygen meter range (0.0-40mg/L), dissolved oxygen saturation (0.0-300.0%) and temperature (0.1-40.0°C; 32.0-104.0°F).
•Dissolved Oxygen Meter Kit: dissolved oxygen meter equipped with a built-in temperature sensor and high-precision gold and silver electrodes, the DO probe delivers fast and consistent readings for efficient monitoring of water quality.Ensure optimal oxygen levels in water with our reliable dissolved oxygen test kit.
•Convenient Functions:Dissolved oxygen meter adopts the digital screen display with backlight, which is more clear and convenient to read data. Auto power-off in 8 minutes if not using it. Low battery indication. Our instruments have temperature compensation function, which can meet normal use and avoid the influence of unstable temperature, air pressure and other factors on oxygen solubility.
•Versatile Usage: The Dissolved Oxygen Meter is suitable for a range of settings, including aquariums, fish tanks, koi ponds, beer brewing, aquaculture, wastewater treatment plants, educational purposes, and various manufacturing applications.When dissolved oxygen test kit measuring and calibrating, needn't open the protective cover of the electrode, just put the electrode in the solution for measurement.

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$94.99

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Rowyet

Rowyet Dissolved Oxygen Meter with ATC,Portable Dissolved Oxygen Test Kit Range 0.0-40mg/L,DO Meter with Electrode Filling Fluid,Water Test Kit for Swimming Pools,Aquarium,Fish Pond.

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•🌊The dissolved oxygen meter has high precision and accurate dissolved oxygen readings,and the test results can be obtained quickly.Through dissolved oxygen test kit you can test water anywhere to get the purest water.
•🐋If the oxygen meter monitor content in the water is lower than 5.0mg/L,it will be difficult for aquatic organisms to survive.If the dissolved oxygen meter content is lower than 1-2mg/L and lasts for several hours,it will lead to the death of a large number of aquatic organisms.So oxygen monitor or dissolved oxygen test kit is so very important for aquaculture,biological reactions and ponds.
•🧪 Measuring range of dissolved oxygen meter:Dissolved oxygen: 0.0-40mg/L,Dissolved oxygen saturation:0.0-300.0%,Temperature:0.1-40.0°C; 32.0-104.0°F.The dissolved oxygen meter automatic temperature compensation made dissolved oxygen test more stable.
•📱 Our dissolved oxygen meter features a digital screen display with backlight that is easy to read,even in low-light conditions.The oxygen meter digital display is clearer and easier to read.Dissolved oxygen test kit can customize parameters by itself.The oxygen meter will automatically turn off if it is not used for about 8 minutes and the low battery alarm function.
•🌊The dissolved oxygen test kit can be used to measure and monitor the oxygen content that affects the reaction rate,process efficiency or environment.Such as aquariums, swimming pools,teaching experiments, laboratory sterile environments,scientific research, environmental testing (lakes, streams, oceans),Wastewater treatment, wine production and others.

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$95.99

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GIDIGI

Dissolved Oxygen Meter Electrolyte Solution 4 * 30ml,Dissolved Oxygen Meter Accessories Electrolyte Solution

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Dissolved Oxygen Meter Electrolyte Solution:Regular replacement of the new electrolyte can help the dissolved oxygen meter probe to stay in the best condition at all times, extending the service life of the tester.
•GIDIGI provides detailed replacement instructions, with clear text and pictures, so that even beginners can quickly complete the replacement.
•Please store in a ventilated and cool place,please tighten the bottle cap after use.
•This electrolyte is suitable for GIDIGI dissolved oxygen meter and other similar products.

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$12.99

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GISNPA

GISNPA Dissolved Oxygen Meter with ATC, 0-40.00 mg/L Measurement Range, DO Meter with Electrode Filling Fluid and Anaerobic Water Calibration Powder (No Backlight)

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Extended Range: Our Dissolved Oxygen Meter features an expanded range of 0.0-40.0 mg/L, surpassing the standard 0.0-20.0 mg/L range. This broader range supports a wide variety of applications, from aquariums to industrial uses.
•User-Friendly Design: Measure and calibrate effortlessly without needing to remove the electrode’s protective cover. Simply immerse the electrode for quick, hassle-free usage. The Automatic Temperature Compensation (ATC) function ensures precise results within a temperature range of 0-50℃, adapting to changing conditions with ease.
•Clear Digital Display: The easy-to-read LCD screen provides clear readings at a glance. Plus, the device features auto power-off after 8 minutes of inactivity and a low battery indicator to ensure uninterrupted usage.
•Complete Package: The kit includes 6 probe protective covers and anaerobic water calibration powder for your convenience and reliability. If you experience inaccurate readings and calibration over time, consider replacing the membrane sleeve. The transparent bottle is designed for preparing anaerobic water. After mixing, place the probe tip inside the bottle for calibration, ensuring the accuracy and performance of the dissolved oxygen meter.
•Wide Range of Applications: Our Dissolved Oxygen Meter is well-suited for measuring dissolved oxygen levels and temperature in various settings, including aquariums, swimming pools, ponds, aquaculture, research, and more. It consistently delivers precise results across diverse environments.

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$78.69

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SULMILE

AZ-86021 Dissolved Oxygen Tester Water Quality Meter D.O Meter Temperature Meter | Can Measure pH Conductivity TDS Salinity by Using Different Probes | Multiple Parameters Water Tester AZ86021

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Large LCD to display multiple parameters in turns: pH, Conductivity or TDS or Salinity, Dissolved oxygen, Temperature (by using different probes). Please note that the standard accessory only comes with D.O probe, If users want to measure pH, Conductivity, TDS or Salinity, users need to purchase pH or Cond. probe(s).
•Displayed parameter is decided by probe type
•Water proof function as IP67
•Fast measuring of dissolved oxygen value
•Accurate replaceable probes with anti-collision cap
•Auto ranging for conductivity measurement (users need to purchase cond. probe to fulfill this function.)
•Auto temperature compensation (ATC); 99 points memories w/recall function
•Multiple points calibration: 3 points for pH, 1 point for D.O., 4 points for conductivity
•Manually altitude and salinity compensation function for D.O. measurement
•Temperature unit ℃/℉ is switchable; 1 hour auto power off; Excellent to use in fresh or sea water aqua farm

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$298.00

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Gain Express

Dissolved Oxygen Meter with ATC Portable DO Meter with Long Cable, Dissolved Oxygen Test Kit Tester with Self Floating Probe Electrode

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•【Pentype Long Cable DO Meter】Features a long cable for convenient measurement in various water environments.
•【Self-Floating Probe】 Ensures accurate readings by measuring dissolved oxygen specifically from water, not influenced by sand or other debris.
•【Accurate Dissolved Oxygen and Temperature Reading】 Provides precise measurements of dissolved oxygen in both percentage and mg/L, as well as temperature in °C/°F units.
•【Built-in Rechargeable Battery】 Equipped with a rechargeable battery that can be conveniently charged using a USB Type-C cable.
•【Switchable DO and Temperature Unit】 Allows users to switch between different units of measurement for dissolved oxygen and temperature.

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$128.69

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