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This is a Sources Sought Notice to replace an existing fiber optic probe velocity and air concentration measurement system. Specifications: Dual tip fiber optic probe with reinforced sapphire tips; 80... This is a Sources Sought Notice to replace an existing fiber optic probe velocity and air concentration measurement system. Specifications: Dual tip fiber optic probe with reinforced sapphire tips; 80 to 100 ?m tip diameter, 2 to 3 mm tip spacing; Greater than 500 kHz sample frequency, 0.033 ?s response time; Adjustable sample time and bubble count limit; 120 volt power supply; Data acquisition system for determining phase presence rate, interface rate and granulomentry; Data acquisition software compatible with Windows version 10; Operation and user guide documents; Shipping and insurance included; and All other components except laptop computer for a turn key system. Location: USDA ARS HERU, 1301 N. Western Rd, Stillwater, OK 74075. This Sources Sought is part of market research (FAR Part 10). No award will be made based on responses received.