Check the listing for details. Milwaukee MW190 MAX Dissolved Oxygen Bench Meter, Auto Calibration USA 110V. Condition: New. Listed at 787.95 USD. The Milwaukee MW190 MAX Bench Dissolved Oxygen meter is one of Milwaukee's most popular industrial meters with its reliable and fast operation as well as its accuracy. 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. DESIGN FEATURES 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 for USA Easy RS232/USB opto-isolated Complete with DO probe, initial calibration solutions and cables.