1.Fully-closed 2.solid-state optical system, 3. grating post-spectro , 4.dual-wavelength ... assay, end point assay, two point assay, multi-point calibration assay, absorption spectrophotometry, dual-wavelength method3. Temperature control system: PELTIER temperature ... wavelength accuracy:≤±2nm Half-wave width:≤±7nmAbsorbance range:0-3.000ABSResolution:0.001ABSCross-contamination:≤1% Sample Volume:200 ...