Special Features:

365-800 nm wavelength; 10 mm clear aperatures; 40-20 scratch dig surface qulaity; 360 degrees continuous rotation; 1 degrees rotation division scale increments; detent index stops - every 45 deg; continuously variable zero-order retarder; precision retardation measurements; uniform retardance over full aperature; continuously variable retardance

Properties:

An instrument which measures the electrical intensity of radiated electromagnetic energy and is usually calibrated in volts per meter or any multiple or submultiple thereof. See also fluxmeter.