Amazon.comIncludes Windows software and USB cable(view larger).Offering automatic datalogging, the Extech HD450 light meter automatically stores up to 16,000 readings or manually store/recall up to 99 readings. It features a large backlit LCD display with a 40-segment bar graph, has a wide range to 40,000Fc or 400,000 Lux, and reads cosine and color corrected measurements.The HD450 utilizes precision silicon photo diode and the spectral response filter and has the handy backlight for readings in low light level areas. The peak mode (10S) captures the highest readings and the relative mode indicates the change in the light levels. This meter offers minimum/maximum reading, a data hold function that freezes the display, a heavy duty rugged double molded housing, and a light sensor with a 3-foot (1-meter) cable.You can connect the HD450 to a Windows-powered PC via the included USB cable to download readings to the included software. The HD450 measures 6.7 x 3.1 x 1.6 inches (HxWxD), weighs 13.7 ounces, and is powered by a single 9-volt battery. It's backed by a three-year limited warranty. What's in the BoxHD450 Datalogging Heavy Duty Light Meter, light sensor with 3-foot cable and protective cover, USB cable, Windows datalogging software, hard carrying case, 9-volt battery, operating instructionsProduct DescriptionExtech HD450 Datalogging Heavy Duty Light Meter Includes Windows software and USB cable (view larger). Offering automatic datalogging, the Extech HD450 light meter automatically stores up to 16,000 readings or manually store/recall up to 99 readings. It features a large backlit LCD display with a 40-segment bar graph, has a wide range to 40,000Fc or 400,000 Lux, and reads cosine and color corrected measurements. The HD450 utilizes precision silicon photo diode and the spectral response filter and has the handy backlight for readings in low light level areas. The peak mode (10S) captures the highest readings and the relative mode indicates the change in the light levels.This meter offers minimum/maximum reading, a data hold function that freezes the display, a heavy duty rugged double molded housing, and a light sensor with a 3-foot (1-meter) cable. You can connect the HD450 to a Windows-powered PC via the included USB cable to download readings to the included software. The HD450 measures 6.7 x 3.1 x 1.6 inches (HxWxD), weighs 13.7 ounces, and is powered by a single 9-volt battery. It. What's in the Box HD450 Datalogging Heavy Duty Light Meter, light sensor with 3-foot cable and protective cover, USB cable, Windows datalogging software, hard carrying case, 9-volt battery, operating instructionsFrom the ManufacturerLight Meter measures from 0 to 40,000Fc and 0 to 400kLux in with 0.01Fc/0.1Lux resolution. It 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, Windows® compatible software with USB cable, hard carrying case, and 9V battery.