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The Neslab TMA Mechanical Cooling Accessory is designed to provide you with a source of continuous cooling for the TMA, while eliminating the need for liquid nitrogen or dry ice. It is a portable, freestanding refrigeration system that can be placed on the floor under a lab bench to conserve counter space. The MCA has a twostage compressor system that operates in a cascade fashion (first one compressor turns on, then the other compressor joins in). Refrigerant is carried from the unit through an insulated coaxial hose to the cooling head.