... maintenance freeTemperature: 37±0.1 centigradeOptical systemLight source: 12V 20W, halogen lamp with lifetime more than 2000 hoursSpectrometer: post spectrometer with arrayed ... , 670nmAbsorbance range: 0~6Calibration/QCCalibration type: single point linear, two points linear, multi-points linear, Logit-4P, Logit-5P,Spline, Exponential 5P, Polynomial ...