Best Dissolved Oxygen Meters in 2026
Daisy
Last Updated: Feb 11, 2026
Daisy
Last Updated: Feb 11, 2026
5.2
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| FREE 3 DAY ARRIVAL SHIPPING | 9.88 | ✅ | ✅ | ✅ |
Portable dissolved oxygen (DO) meter for educational, aquaculture, water analysis, and environmental analysis applications
Two-point manual calibration, automatic temperature compensation from 0 to 30°C
LCD screen
Polarographic probe with 3m cable and screw-on cap membrane
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Gain Express | 9.86 | ✅ | ✅ | ✅ |
【Easy Calibration】Easy 100% D.O value calibration
【Data Storage】Stores and Recalls 99 points, Real Time Indication for Each Memory
【User-friendly Adjustment】Auto Temperature Compensation; Manual Salinity and Barometric Pressure Compensation
【High Accuracy】Accurate Dissolved Oxygen readings
【 Versatile 】 is suitable for a variety of water types, including freshwater, seawater, and wastewater. It's an all-in-one tool that can be used in various settings, from aquariums to industrial plants.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| ❌ | ❌ | ❌ |
🌐The dissolved oxygen meter has high precision and accurate dissolved oxygen readings,and the test results can be obtained quickly.The Bluetooth dissolved oxygen meter supports mobile phone applications,and the bluetooth data is transmitted accurately in real time,and the aquarium water test kit measured value is clear at a glance.Allows you to save,manage and share test data at any time.
📱 The digital display dissolved oxygen meter adopts the mobile phone APP to control the backlight digital display.The tint 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.
🧪 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.
🐋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.
🌊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 be applicable window tint meter.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| RC-Yago | 6.51 | ✅ | ✅ | ✅ |
Dissolved oxygen meter is a precision instrument for measuring dissolved oxygen and temperature. The dissolved oxygen probe is a thin film with a polarographic sensor and a thermistor for temperature measurement and temperature compensation. The permeable membrane separates the measured solution from the sensing electrode but allows oxygen to pass through the membrane to react, and the concentration can be measured.
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. The oxygen concentration of our dissolved oxygen meter is 0.0-40.0mg/L, most of the range of dissolved oxygen meters on the market is 0.0-20mg/L. When measuring and calibrating, needn't open the protective cover of the electrode, just put the electrode in the solution for measurement.
Detachable probe, easy to replace, equipped with 6 probe protective covers. The film inside the protective cover cannot be taken apart. After using for a period of time, the test value is inaccurate and the calibration is still inaccurate, and the membrane sleeve needs to be replaced.
Adopts the digital screen display, which is more clear and convenient to read data. Auto power-off in 8 minutes if not using it. Low battery indication. Oxygen solubility will be affected by temperature, atmospheric pressure, and salinity. Our instrument with temperature compensation can meet normal use.
It is very suitable for measuring the dissolved oxygen level and temperature in a wide range of aquariums, swimming pools, ponds, freshwater aquaculture, marine aquaculture, school teaching experiments, laboratory sterile environment, aquaculture, scientific research, and other fields.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| ❌ | ❌ | ❌ |
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. when measuring and calibrating, needn't open the protective cover of the electrode, just put the electrode in the solution for measurement.
Bluetooth dissolved oxygen meter with accurate real-time Bluetooth data transmission and clear measurement values. It allows you to save, manage and share test data at any time without worrying about data loss.
Detachable probe, easy to replace, equipped with 6 probe protective covers. The film inside the protective cover cannot be taken apart. After using for a period of time, the test value is inaccurate and the calibration is still inaccurate, and the membrane sleeve needs to be replaced.
Digital dissolved oxygen meter fully customizable parameter settings. set do max or min limit values according to the user's requirement. If testing results are out of range, the digits will display in red, notifying you of any values exceeding your preset range.
Adopts the digital screen display with backlight, multi-parameter display at the same time, mobile phone App control backlight display. If it is not used, it will shut down automatically after 10 minutes. oxygen solubility will be affected by temperature, atmospheric pressure, and salinity. our instrument with temperature compensation can meet normal use.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| AMTAST | 9.13 | ✅ | ✅ | ✅ |
LCD Displays DO or Saturation O2 and Temperature simultaneously. Displays Maximum/Minimum value and data hold.
Ideal for measuring dissolved oxygen levels and temperature in wide range, aquarium, school teaching experiment, lab sterile environment, aquaculture, scientific research etc.
Automatic Temperature Compensation, Manual Salinity (MSC) and Altitude (MAC) Compensation, and degree ℃/℉ switchable. Icon DO O2 and unit mg/L, ppm, %, ℃, ℉ for recognition easy during select function mode. Easy to replace DO probe module by user.
Waterproof IP-57 standard and rugged design for field use conveniently. It can float on water.
Low battery and consumption indicator (Batteries NOT Included). Auto shut off after 10 minutes of non use. Note: The display could not auto shut off under MAX/MIN mode.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| RC-Yago | 6.51 | ✅ | ✅ | ✅ |
Dissolved Oxygen Meters: Oxygen meter comes with electrolyte, you can test water DO(dissolved oxygen) and temperature(℃/℉) Facilitate the user to carry on-site operation to display dissolved oxygen values and temperatures.
Temperature Compensation: DO meter enjoys less than 30 seconds fast testing, 0℃ - 40℃ ATC Function(automatic temperature compensation), and automatic calibration.
Easy to Operate: Freshwater aquarium test kit, portable and lightweight, is convenient to carry around and test on-site. A large LCD display with backlight allows you to clearly read data.
Test to Get The Purest Water: Compact pen-shape design, lightweight for mobility, you can test water anywhere to get the purest water.
Wide Application: Soil-free growing, aquarium, swimming pools, freshwater culture, mariculture, beverage factory, wastewater treatment plant, laboratory, and etc.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| weidiechenshangmaoyouxiangongsi | 0.00 | ❌ | ❌ | ❌ |
The oxygen measuring range of our dissolved oxygen meter is as wide as 0.0-40.0mg/L, more practical than other dissolved oxygen meters on the market.
High accuracy, quick response and fast reading, our dissolved oxygen meter is convenient to use.
Small pen shaped design, our dissolved oxygen meter is lightweight and easy to carry. You can test water anywhere to get the purest water.
The dissolved oxygen meter has a digital screen which shows information clearly in a glance with backlight.
Our dissolved oxygen meter is widely used in fresh water aquaculture, marine aquaculture, swimming pools, labs, beverage factories, etc.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Plauere-us | 9.06 | ✅ | ✅ | ✅ |
Portable Oxygen Test Tool: Test the DO(dissolved oxygen) value and temperature(℃/℉). Small pen‑shaped design, light and easy to move, you can test water anywhere to get the purest water. Detachable probe, easy to replace, probe excuse is not easy to fall off.
Portable Oxygen Test Tool: Test the DO(dissolved oxygen) value and temperature(℃/℉). Small pen‑shaped design, light and easy to move, you can test water anywhere to get the purest water. Detachable probe, easy to replace, probe excuse is not easy to fall off.
Portable Oxygen Test Tool: Test the DO(dissolved oxygen) value and temperature(℃/℉). Small pen‑shaped design, light and easy to move, you can test water anywhere to get the purest water. Detachable probe, easy to replace, probe excuse is not easy to fall off.
Compensation Function: Dissolved oxygen meter with automatic temperature compensation function, the temperature of the solution can be automatically compensated for 0‑40℃, and the reading is accurate and stable.
High Accuracy: Digital dissolved oxygen analyzer can quick response, quick test results can be detected, any 0.0‑40.0mg/L liquid can be tested. Dissolution: ±1.5%F.S, dissolved oxygen saturation: ±1.5%F.S, temperature: ±0.5℃.
Easy to Read: The digital screen display with backlight makes the data read more clear and convenient, can easily switch ℃ and ℉,meet your basic need, perfect for sewage treatment, aquarium, laboratory.
Applicable Scene: Portable dissolved oxygen meter is suitable for freshwater aquaculture, marine aquaculture, swimming pools, beverage factories, sewage plants, environmental testing (lake, stream, ocean), and laboratories. 100% SATISFIED WITH THE SERVICE, PLEASE CONTACT US IF YOU HAVE ANY QUESTIONS.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Comdryus | 9.39 | ✅ | ✅ | ✅ |
【Precision Instrument】Dissolved oxygen meter is a precision instrument for measuring dissolved oxygen and temperature. The dissolved oxygen probe is a thin film with a polarographic sensor and a thermistor for temperature measurement and temperature compensation. The permeable membrane separates the measured solution from the sensing electrode but allows oxygen to pass through the membrane to react, and the concentration can be measured.
【Data Storage & Synchronization】The data of dissolved oxygen meter can be automatically saved and manually saved, the saved data can be exported to an Excel table, and can also be shared with your friends. Water quality analyzer independent mobile APP, data synchronization, comprehensive functions, worry free and energy saving, easy to operate.
【Detachable Probe】Smart dissolved oxygen meter uses a highly sensitive probe, accurate measurement data, and detachable, easy to replace, equipped with 6 probe protective covers. The film inside the protective cover cannot be taken apart. After using for a period of time, the test value is inaccurate and the calibration is still inaccurate, and the membrane sleeve needs to be replaced.
【Easy to Use】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. The oxygen concentration of our dissolved oxygen meter is 0.0-30.0mg/L. Oxygen solubility will be affected by temperature, atmospheric pressure, and salinity. Our instrument with temperature compensation can meet normal use.
【Wide Application】Digital dissolved oxygen meter is very suitable for water source detection, dissolved oxygen level and temperature in various aquariums, swimming pools, aquaculture, sewage treatment, agricultural irrigation, laboratories, farms, school teaching experiments, laboratory sterile environments and other fields.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Jasmine Garden Valley | 6.84 | ✅ | ✅ | ✅ |
Measures dissolved oxygen in % and mg/L plus temperature. Range 0 to 500% / 0 to 50.0 mg/L. Measuring principle is Dissolved oxygen polarographic electrode.
Automatic temperature compensation via temperature in probe provides accurate reading over the entire range. °C or °F unit switchable. 0 to 50.0 °C (32.0 to 122.0 °F).
Adjustable barometric and salinity compensation. Barometric pressure compensation: 0 to 1000 mmHg; Salinity compensation: 0 to 70.0 ppt.
Support 1 and 2 points dissolved oxygen calibration at 100% water-saturated air and in 0 oxygen solution.
Hold function freezes readings for easy viewing and recording. Equipped with a large backlit LCD display. Comes with a plastic toolbox convenient for in-field use. Powered by 4 AAAA alkaline batteries.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| ❌ | ❌ | ❌ |
Battery: 4 x c batteries (included)
Buffer recognition: din, nist, and usa
Conductivity accuracy: 1 percent fs
Conductivity resolution: 0.001, 0.01, or 0.1 ms; 0.001 or 0.01 use
Data logging (points): 10,000 data sets
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HORIBA Instruments Incorporated | 5.05 | ❌ | ❌ | ❌ |
Package Dimensions: 20.0" (L) x 20.0" (W) x 18.0" (H)
Product Type: Precision Measuring
Package Quantity: 1
Country Of Origin: Japan
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Cole-Parmer | 6.83 | ❌ | ❌ | ❌ |
Conductivity accuracy: 0.5 percent of reading or 0.001 ms/cm, whichever is greater (up to 100 ms/cm); 1.0 percent of reading from 100 to 200 ms/cm
Data logging (points): 100, 000 data points; 100 user-defined sites; 100 user-defined data id tags; 400 detailed glp records
Display type: graphic lcd
Dissolved oxygen resolution: 0.1 or 0.01 ppm; 0.1 or 1 percent saturation
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HORIBA Instruments Incorporated | 5.05 | ❌ | ❌ | ❌ |
Battery: 4 x c batteries (included)
Buffer recognition: din, nist, and usa
Conductivity accuracy: 1 percent fs
Conductivity resolution: 0.001, 0.01, or 0.1 ms; 0.001 or 0.01 use
Data logging (points): 10,000 data sets
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Horiba | 3 |
| Rcyago | 3 |
| Amtast | 1 |
| Cole-Parmer | 1 |
| Gain Express | 1 |
| Hozee | 1 |
| Maidat | 1 |
| Milwaukee | 1 |
| Santacary | 1 |
| Sorandy | 1 |
We've carried out a comprehensive analysis of 217 reviews on dissolved oxygen meters, using our selection criteria to identify the best options in the test, measure & inspect. Our findings reveal that most customers typically select dissolved oxygen meters priced around $1,102.44, with top brands including rcyago, milwaukee, maidat, extech, gain express, ysi, bante instruments, amtast and vorole and hozee
Our team of expert editors reviewed these high-quality items and handpicked the top 15 dissolved oxygen meters for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the test, measure & inspect category. These include rc-yago, free 3 day arrival shipping, amazon.com, gain express, bante instruments inc., amtast, weidiechenshangmaoyouxiangongsi, plauere-us and comdryus and jasmine garden valley .
We are dedicated to assisting our users in finding the right meters Products based on their needs, saving them considerable time when choosing which dissolved oxygen meters to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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