The model DO200US is discontinued effective immediately. All DO200US requests should be converted to DO200As. They use the same probe and cable assemblies.
Some differences between the instruments include:
*Casing: The DO200A (gray in color) is waterproof where the DO200US (yellow in color) is water resistant.
*Temperature: The DO200A reports temperature in Celsius. The DO200US reports temperature in Fahrenheit.