Product_description: ['The Keithley 2500INT-2-GE 2-inch Integrating Sphere with a Germanium detector is a accessory for the Keithley 2502 accepts direct optical input and provides for accurate L measurement without being sensitive to polarization mode or beam profile at the end of the fiber. The integrating sphere is available with a germanium detector to ensure accurate optical power measurements at any wavelength.']

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