Three Measurements at Once; UV Transmission, Visible Transmission, and Infrared Transmission. The Most Complete Sales Tool.Test Single, Double, or Triple Panes. Spectrum Detective Energy Transmission Meter is able to simultaneously display UV, Visible and Infrared transmission values. Being a self-contained system, there are no additional light sources or power chords necessary, and no adjustments to make. Simply slide the glass sample into the opening and watch the resulting performance data appear on the display. Perform LIVE demonstrations of the performance of your Energy Efficient Window Products. Simple, fast and convincing; this instrument will take sales demonstrations to a whole new level! Uses one standard 9 VDC battery (included)