... 3.Prestore famous brand reagent working curve COD220 portable COD analyzer with working curveFeatures1,LCD display, small size, light weight, ... , automatic zero adjustment,automatic readout concentration and absorbtion reading with sample No.after insert tube in 1second, without building ... hours (2500mAh AA Ni-H batteryStandard configuration 1) COD220 COD Analyzer 1 set2) SD card (2G) 1pc3) SD card ...