Rasci calibration bath outer fabrication of Mild steel with powder coated and Inner Fabrication of Stainless Steel .The RTCL are insulated with ceramic fiber mat to reduce the radiation Cool loss to Minimum This is suitable for Low Temperature Sensor, Indicator and Rtd sensors calibration Method of master Comparison. High accuracy temperature controller With Tyristor Contactor based control circuit. The RTCL Cooled by High Quality Compressor and Maintain Temperature use Heater .Insulation with high quality superior quality Insulator.