10 Best Dissolved Oxygen Meters


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Dissolved Oxygen Meters can measure the level of dissolved oxygen in the water. Less amount of oxygen inflicts danger to life. On the other hand, an excess of dissolved oxygen (DO) may harm the aquatic life.

You can find the best Dissolved Oxygen measuring meters in the list below.

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10. Lutron Dissolved Oxygen Meter ($308.99)

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This dissolved oxygen meter has a range of 0 to 20 mg/L. It is pocket-sized and comes with a 13 mm LCD. It has the resolution of 0.1 mg/L.

Available here.

9. Gowegroup Testers Dissolved Oxygen Meter ($439.00)

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Image Credits: Amazon

This meter has a range of 0~19.99 mg/l and 0~19.99 ppm. The unit has an integrated large LCD which displays the values along with stability indication. It auto compensates the temperature, salinity, and barometric values and has an auto power OFF. You can also hold values. It has an RS232 port for connection to a PC and has an IRDA port for printing.

Available here.

8. Milwaukee Dissolved Oxygen Meter ($489.95)

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Image Credits: Amazon

This Mi605 portable dissolved oxygen meter is useful for applications in fields such as environment, aquaculture, etc. The unit automatically calibrates in the saturated air and allows automatic temperature compensation from 0 to 50 degrees Celsius. In the large LCD, you can hold the button to freeze the screen. This device has a polarographic DO probe with a 3 m cable and screw on cap membrane. The blinking battery symbol indicates low battery.

Technical Specifications:

Range (O2, % saturation O2, Temperature)0.0 to 45.00 mg/L (ppm), 0.0 to 300%, 0.0 to 50.0°C / 32 to 122°F
Resolution (O2, % saturation O2, Temperature)0.01 mg/L (ppm), 0.1%, 0.1°C
Accuracy (O2, % saturation O2, Temperature)+ or – 1.5% Full Scale, + or – 1.5% Full Scale, + or – 0.5°C
Power source9 V battery (included)
Dimensions200 × 85 × 50mm (H x W x D)
Weight (with battery)280 g

Available here.

7. Thermo Scientific Orion Dissolved Oxygen Meter ($1445.53)

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This portable and waterproof dissolved oxygen meter kit can be used for testing samples anywhere. The unit has a backlit graphic LCD which shows time, date, sample ID, user ID, and calibration information. It comes with a rugged 3 m long stainless steel optical/ luminescence-based guard with a calibration sleeve. The memory can hold up to 1000 data points with time and date stamps, and measurements can also be taken at set intervals. It comes with a hard carrying case. It is ideal for applications including sewage and water treatment plants, pollution control, fish farms, and various types of manufacturing.

Available here.

6. General Tools Dissolved Oxygen Meter ($504.67)

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This dissolved oxygen meter accurately measures dissolved oxygen concentration of liquid or air using a heavy-duty polarography oxygen probe. The measurement range for dissolved oxygen is 0 to 20 mg/L, while the range for oxygen in the air is 0 to 100% and that of temperature is 32 to 122 degrees F. This unit is easy to calibrate and supports automatic and manual data logging. The unit also automatically compensates for temperature, altitude and salt contents of liquid. It has a backlit LCD measuring 1.5 x 2.0 inch.

Available here.

5. YSI Dissolved Oxygen Meter ($452.72)

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This DO meter includes probes with 4-meter cable and a fitted case. The unit allows automatic temperature compensation, and the memory feature retains up to 50 data sets. This IP67 rated housing is waterproof, protecting the unit from air-borne particles and water. It is ideal for determining oxygen concentration in drinking water, the health of lakes or streams or aquatic organism sustainability. It is a useful tool for sewage and water treatment plants.

Available here.

4. Milwaukee Dissolved Oxygen Meter ($170.00)

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This meter comes complete with a polarographic probe, a 3 m cable, calibration screwdriver, five spare membranes, electrolytic solution, battery, and instructions. The unit features the O2 range of 0 to 19 PPM with a resolution of 0.1 ppm and open air calibration. It is suitable for a variety of applications.

Available here.

3. YSI Dissolved Oxygen Meter ($843.72)

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This handheld DO meter comes with a 12-inches long cable and a probe. It is ideal for measuring the quantity of DO in fresh, sea, or polluted water in the field. The unit automatically compensates for temperature, salinity, and altitude. The backlit LCD allows observing readings in dimly lit areas, and the polarographic probe comes with field replaceable electrode module. The unit is impact resistant and waterproof. It runs on four alkaline C cell batteries.

Technical Specifications By The Manufacturer:

DO (%) range0 to 500%
DO (%) resolution0.1% air saturation or 1% (selectable)
DO (%) accuracy0 to 200%: + or – 2% of reading or 2% air saturation, whichever is greater; 200 to 500%: + or – 6% of reading
DO range (mg/L)0 to 50 mg/L

“Great product! I’ve had mine since 07 and just recently stopped working. This thing has been working day and night for the past eight years on a shrimp farm in the harshest conditions possible. Great buy if you are considering something heavy duty.” – Amazon’s Customer Review.

Available here.

2. Extech Dissolved Oxygen Meter ($439.99)

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Image Credits: Amazon

This dual display DO meter is also useful for temperature readings. The unit measures DO in water from 0 to 20.00 mg/L and oxygen in the air from 0 to 100% with a resolution of 0.1 mg/L DO and 0.1% O2. The unit also automatically compensates for temperature, records and recalls minimum, maximum and average readings. The unit also has a built-in RS-232 PC serial interface with optional data acquisition software and data logger.

“We’ve used this in the field for some 18 months. It’s quick, responsive and nicely made. It’s accurate, sold at a good price and a 5-star product.” – Amazon’s Customer Review.

Available here.

1. Hanna Instruments Dissolved Oxygen Meter ($445.00)

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Image Credits: Amazon

This water-resistant DO meter comes with a 4 m cable. The unit is capable of automatic compensation of temperature, salinity, and altitude. It has a backlit LCD screen. The galvanic DO probe requires no conditioning time to measure multiple samples quickly. It has a water-resistant case to provide protection in the field. Three 1.5 Volts batteries power the unit.

Technical Specifications By The Manufacturer:

Range0.0 to 50.0 mg/L (ppm) O2, 0 to 600% O2,?-5.0 to 50.0°C
Resolution0.1 mg/L or 1% (O2) / 0.1°C
Accuracy+ or – 1% of reading (O2) / + or – 0.2°C

“Great price for a DO meter that reads up to 45ppm DO. One issue, it seems to need to be calibrated with each use. However, calibration is fast and straightforward, so it’s not a big deal as long as you remember to do it each time. It takes about 15 seconds to calibrate. We have bought a lot of instruments made by Hanna and have always been happy with price and quality. Gaia Water Ltd.” – Amazon’s Customer Review.

Available here.

We would appreciate your valuable feedback in the comments’ section below.

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10 Best Dissolved Oxygen Meters

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