Features Automatically stores up to 16,000 readings or manually store/recall up to 99 readings Large backlit LCD display with 40-segment bar graph Wide range to 40,000Fc or 400,000 Lux Cosine and color corrected measurements Utilizes precision silicon photo diode and spectral response filter Peak mode (10mS) captures highest reading Relative mode indicates change in light levels Min/Max and Data Hold Backlight for readings in low light levels Heavy Duty rugged double molded housing Built-in USB port Specifications Display: 4000 count backlit LCD Fc Range: 40, 400, 4000, 40kFc Lux Range: 400, 4000, 40k, 400kLux Max. Resolution: 0.01Fc/0.1Lux Basic Accuracy: ±5% Cosine & Color Corrected: Yes PC Interface: USB with software included Datalogging: 16,000 data (continuous)/ 99 data (manual) Dimensions: 6.7x 3.1x1.6" (170x80x40mm) Weight: 13.7oz (390g) The HD450 Light Meter measures from 0 to 40,000Fc and 0 to 400kLux with a 0.01Fc/0.1Lux resolution. Features: 5% accuracy, Peak mode (10µs), Relative mode, Min/Max, Data Hold, backlit LCD display with 40-segment bar graph, and a rugged double molded housing. In addition, the datalogger function can automatically store up to 16,000 readings or manually store/recall up to 99 readings. Comes complete with light sensor with 3ft (1m) cable and protective cover, software with USB cable, hard carrying case and 9V battery.