All of the functions of 48100-01, plus max-min-ave functions, automatic power off, RS232C output and a detachable probe for easier replacement or repair. Higher range of up to 50,000 Lux, 5000 foot candles. Meter has the ability to compensate for the different colors of tungsten, fluorescent, mercury and sun light, with the push of a button. The result is readings true to actual lighting conditions. Also compares the % difference between two light intensities. Comes with a soft carrying case and a 9V battery. Dim: meter 7" x 3" x 1-1/4", sensor 3" x 2" x 1/2".