The Dry-Block Kjeldhal is an economical, compact, constant–temperature heating system suitable for Test tubes etc. Dry-Blocks are particularly suitable in the Laboratory for digestion, incubation, boiling and variety of Industrial application. The system comprises of a heater base dry-Block of metal alloy provided with holes to accept 40 test tubes of 26 mm dia × 250 mm long/20 test tube of 42 mm dia. × 290 mm long. Block heaters have been fixed at the base of the dry-block duly embossed. Temperature is maintained uniform throughout the block. Temperature range upto 450°C with the help of solid state digital temp. controller cum indicator.