The Extech 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.