Mineralizer MB 332 and MB 442 are designed for mineralizing of samples in the wet way in tubes with 41 mm outside diameter and the temperature of 400-440° C (for example determination of protein acc. to Kjeldahl's method, determination of fiber, etc.). Mineralizers are constructed for simultaneous mineralization of up to 9 (MB 332) or 16 (MB 442) samples. Both models consist of heating heating block and separate control unit. The heating block is to be placed in a chamber with fume exhaust or it could be supplied with a fume exhaust. The control unit can be located anywhere on the place comfortable for operation no farther than 6 m from the heating block.