The Grant Instruments CW5 Heat Exchange Coil is a specialized accessory designed for use with Grant Instruments' heating circulators and water baths. Its primary function is to provide efficient temperature control and precise heating by circulating water through the coil, allowing for controlled heat transfer to external systems or applications. The CW5 Heat Exchange Coil is especially useful in situations where indirect heating is needed, or when integrating a temperature control system into a broader experiment setup.