Automatically stores up to 16,000 readings or manually store/recall up to 99 readings. Records in a continuous mode up to 16,000 readings. Wide range to 4,000Fc or 40,000Lux. Cosine and color corrected measurements. Utilizes precision silicon photo diode and spectral response filter. Peak mode(10S)captures highest reading. Relative mode indicates change in light levels. Heavy duty, rugged double molded housing. Built-in USB port. Includes light sensor and protective cover with 39 in. (1m) cable, Windows 95/98/NT/2000/ME/XP compatible software with USB cable, built-in stand, hard carrying case, and 9V battery.