UV SensorMeasures the sunburning portion of the UV spectrum. Allows you to display UV index, dose rate, and daily and accumulated dose.Multi-layer filter provides a spectral response that closely matches the Erythema Action Spectrum. Diffuser provides excellent cosine response. Two-piece housing minimizes radiation heating, allows convection cooling of the sensor, and prevents the trapping of water or dust. Includes built-in level and 2' (0.6M) cable.Compatible with both original Vantage Pro and Vantage Pro2. (Already included with Vantage Pro Plus and Vantage Pro2 Plus.)You may also need a Solar Sensor (#6450) and Sensor Mounting Shelf (#6673). Quick Guid https://productimageserver.com/literature/quickGuide/52166QG.pdf Owners Manual https://productimageserver.com/literature/ownersManual/52166OM.pdf Brand: Davis InstrumentsUPC: 011698002436Harmonization Code: 9025.80.50.50Model Number: 6490Weight: 0.4 Length: 6 Height: 3 Width: 4