COD DIGESTOR: Microprocessor Based. Room Temperature To 210°C Timer: 0-999 Min. Aluminium Heating Block for 27 Tubes (Hole of 60mm x Dia 17mm) with 10 no.s Opti Borosilicate Glass Tubes. COD ANALYZER: Microprocessor Based Table Top Model. 20*4 Lcd Display. 6 Point Calibration With Auto Curve Fitting. Inbuilt Long Life Monochromatic Light Source. Printer Facility & PC Compatibility