Based on the Linux operating system, color graphical interfaces, large and color LCD. Operating with touch screen, function keys and external USB mouse or keyboard, which is simple and fast. Multiple measurement methods (End point, Two-point, kinetics, double wavelength) are optional, and multiple calculation methods (factor, linear regression, curvilinear regression, etc.) are also optional. Store 500 test items and 10000 test results; supply many methods of printing and many formats of report. Each item can be set for two quality-control, automatically statistic and draw QC curve, store one year''''s QC data and QC chart, also can query and print. Auto-dormancy for the lamp to prolong its life. Power-off protective function to automatically save measurement results. Seft-check function for alarming to light route, liquid route and machine components, etc. Technical parameters Absorbency range: -0.3-3.0Abs Resolution: 0.001Abs(display), 0.0001 Abs(inner calculation) Light source: Halogen lamp Wavelength: 340, 405, 500, 546, 578, 620nm + 2 free positions Stability:≤0.005A/30min Half-bandwidth: ≤12 nm Temperature control: Room Temperature, 25, 30, 37. Temperature accuracy: ±0.1 Colorimetric cell: 30μl quartz flow cell Injection: 0~6000ul Cross Contamination: ≤1.0% Storage: 500 test items and 10000 test results. Interface: Standard RS232 interface, 4 USB interfaces, Ethernet interface Display: 7″color LCD Print: Built-in high-speed thermal printer, and connect external printer. Processor: Embedded high-speed processor Weight: 10kg Dimension: 410(L)×340(W)×150(H)mm Power Supply: 100~240VAC, 50HZ/60HZ