HD450 illuminance meter with data logger Functions: Hold, maximum/minimum value display, backlight, bar graph display Memory: Automatic/16,000 continuous data, manual/99 data Accuracy (g): ±5% rd Interface: USB Compatible OS: Windows RXP/VistaTM/7 (32bit only) Size (mm):80 x 40 x 170 电源(V):9V电池(包括用于测试) 电源:9V电池(包括用于测试) 电源:9V电池:9V电池(包括用于测试)