The SDL400 saves data to an SD card in Excel format. Wide range up to 10,000Fc or 100kLux. Cosine and color-corrected measurements. Precision silicon photo diodes and a spectral response filter are used. Offset adjustment is used for the zero function to provide relative measurements. The data sample rate is adjustable. Stores 99 manual readings and 20M readings on a 2GB SD card. Type K/J thermocouple input for high-temperature measurements. Large, backlit LCD display. Record/recall the minimum, maximum, data hold, and auto power off. Comes with 6 AA batteries, an SD card, a sturdy carrying bag, and a light sensor with protective cover.