To determination of Chemical Oxygen Demand. It is a solid state block heated unit with provision for samples to be digested at a time in 38 mm. dia reaction vessels with 20 ml sample size of heat at temp. of 150°C + 1°C controlled by solid state digital temp. indicator-cum controller Micro Processor Based (P.I.D.). It has provision for 15 samples and is supplied with 15 nos. glass reaction vessels and 15 nos. air condensers. Fitted with a 2 hour timer, the samples after being digested for 2 hours can be analyzed using calorimeter or conventional titration method. To work on 220/230 volts AC.