Digital Portable High Precision Meterial Product Description Measuring Aperture 0.3 inch (8 mm) Light Conditions CIE Recommended: 8/Sunlight Source D65 Sensor Photodiode Array Observer CIE 10 Standard Observators Measurement Range L: 0-100 Repeat Accuracy: 0 Groups Test Sample Data: 100 Group Bulb Life 5 Years 1.6 million times TFT True Color 2.8 inch @ (16:9) Language English/Chinese Simple External Interface: USB 2.0 (USB-B) RS-232 (115200 bps) Operating Temperature Range: 0-40 (32-104) Storage Temperature Range: -20-50 (-4-122) Humidity Range: 85% % Less than a condensation free weight Size 700 g: 7.9 x 2.7 x 3.5 inches (199 x 68 x 90 mm); Package Size: 15.7 x 9.4 inches (400 x 240 x 340 mm); Battery Charging Time: 8 hours; 5,000 times; Standard Accessories: AC adapter; 3,000000000000000000000 mAh Li-ion battery optional accessories: Flour meter; Microprinter.