PR-680 SpectraDuo marks the beginning of a new era in light measurement. This unique patent pending, battery powered portable instrument is the first and only combined fast-scanning 256 detector element spectroradiometer and PMT based photometer on the market. The PR-680 has three available operating modes,A fast scanning spectroradiometer (like the PR-655, A highly sensitive photometer (like the PR-880),Auto Select mode which automatically selects between detectors based on the available signal.The PR-680 is supplied with 4 Automated Measuring Apertures (1°, 0.5°, 0.25° and 0.125°) and an Automated Measure Shutter. Other hardware features include AutoSync® for automatically synchronizing to the source refresh rate insuring the utmost accuracy, a Secure Digital (SD) port for measurement storage, an External Trigger port allowing remote measurement activation from either a push button or peripheral device, and a long lasting rechargeable Lithium-Ion (Li-Ion) battery.