... grating post–spectro and fixed wavelength, can take dual-wavelength measurement3. 20 years of maintenance-free period for ... multi-point calibration assay, absorption spectrophotometry, dual-wavelength method3. Temperature control system: PELTIER temperature control component, 25°C, 30°C, ... 405, 450, 492, 510, 546, 578, 630nm5. Quality control: QC data summary, store and draw QC diagram6. Open reagent ...