Using InGaAs or Si photodiodes followed by variable gain transimpedance amplifier, Model OE-300 covers 320–1,700 nm wavelength range. Unit has switchable gain from 102 to 108 V/A giving precise measurements within wide dynamic range from nanowatts up to 10 mW optical power. Using free space input option, OE-300 works with standard optical accessories like tubes and lenses. FC and SMA optical fiber inputs are also available.