Dissolved Oxygen Bench Meter With Automatic Calibration (MW190)

The Milwaukee MW190 MAX Bench Dissolved Oxygen meter is one of Milwaukee’s most popular meters with its reliable and fast operation as well as its accuracy.


  • RANGE: 0.00 to 45.00 mg/L (ppm) O2 | 0.0 to 300.0 % O2| Temp. -5.0 to 55.0°C / 23.0 to 131.0°F
  • RESOLUTION: O2 0.01 mg/L (ppm) | 0.1% O2 | Temperature 0.1°C / 0.1°F
  • ACCURACY: O2 ±1.5% of Full Scale| Temperature ±0.4°C (±0.8°F)
  • CALIBRATION: Automatic, single (offset) or dual with slope 100% saturated air

Product Overview


The Milwaukee MW190 MAX DO Bench Meter is preferred by people looking for lab level accuracy without the high cost. The Milwaukee DO Meter is popular with everyone from field biologists, educators, fish farmers, koi pond owners, education, water treatement plants and laboratories.


  • Fast, easy-to-read results with large digital LCD readout.
  • Repeatable, accuracy to ±1.5% FS.
  • Lightweight and has a small benchtop footprint.
  • Single offset or dual point slope with open air 100% saturation calibration. 
  • Altitude and Salinity compensation. 
  • Automatic temperature compensation.
  • Uses MA845 (included) reinforced polarographic probe with an oxygen-permeable polytetrafluroethylene (PTFE) membrane sensor
  • 5 o-rings, membranes and one protective cap included
  • 2 meter probe cable for extra flexibility when testing
  • Logging up to 50 samples.
  • 12 VDC power supply.
  • Easy RS232/USB opto-isolated
  • Complete with DO probe, initial calibration solutions and cables.


O2 Range 0.00 to 45.00 mg/L O2 (ppm)
% Saturation O2 0.0 to 300.0% O2
Temperature Range -5.0 to 55.0°C (23.0 to 131.0°F)
O2 resolution 0.01 (ppm) mg/L
% Saturation O2 Resolution 0.10%
Temperature Resolution 0.1°C / 0.1°F
O2 Accuracy ±1.5% Full Scale
% Saturation O2 Accuracy ± 1.5% Full Scale (@20°C / 68°F)
Temperature Accuracy ± 0.4°C (±0.8°F)
Calibration DO Automatic single (offset MA9070) or dual point with slope in 100% saturated air
Calibration Temperature 2 point at 0 and 50°C (32.0 and 122.0°F)
Altitude compensation 0 to 4000 m (13,120′)
Altitude Resolution 100 m (328′)
Salinity Compensation 0 to 40g/L
Salinity Resolution 1 g/L
Temperature Compensation Automatic, 0.0 to 50.0°C (32.0 to 122.0°F)
Probe MA840/2 polargraphic probe (included)
Membranes 5 included with O-Rings (included)
Computer Interface RS232/USB opto-isolated
Power Supply 12 VDC (included)
Dimensions Meter 230 x 160 x 95 mm (9.0 x 6.3 x 3.7 inches)
Weight 0.9 kg (2.0 lbs.)
Environment 0 to 50°C / 32 to 122°F; max RH 95%

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