Double walled. Outer body: Outer body of thick PCRC, pre-coated corrosion resistant. GI sheet duly pre treated with long lasting stove enamel or elegantly powder coated. The inner chamber made of SS (304) . Single Door with lock and key arrangement with magnetic door closer. Door has a glass viewer window. Insulation high grade PUF. The back of test chamber provided with 2/4/6 air circulation fans for uniform maintenance of the temperature throughout the chamber. Temperature Range-10 to 60°C ± 1 °C. Temperature controlled by microprocessor based digital display LCD system. Compressor: Hermetically Sealed Air Cooling Compressor refrigeration unit CFC free refrigeration unit. Power: 220-230 Volts AC, 50/60 Hz Single Phase.