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The Gould-Bass DLM-1500 Digital Radiometer is a portable, 3-1/2 digit instrument that measures a spectral range of 380-700 nanometers both luminance in Footlamberts, or illuminance (photopic response) in your choice of Footcandles or Lux. The latest LSI circuit design and display technology is used to achieve the lowest possible component count. This, in turn, assures reliability, accuracy, stability, and rugged dependability. In combination with its functional and aesthetic design, the Gould-Bass DLM-1500 is the easiest to handle light measuring instrument available today. The "DigiGlo" LCD display provides constant fluorescent illumination with no battery draw.