This is a double walled serological bath with outer and inner wall made of stainless steel. The gap between the walls is filled with glasswool to minimize loss of temperature. A thermostat, at any point from 50C, controls the temperature automatically above room temperature to 600C with an accuracy of + 0.50C and operates on single phase AC current. A built-in pilot lamp is also provided indicate the working of thermostat. Kahn racks to hold 40 tubes, are available at extra cost. The racks are made of stainless steel or brass.