An assembly of devices intended to evaluate a patient’s vestibular function through the application of heat and/or cold stimuli in the form of a stream of air or water into the ear canal, whereby involuntary horizontal eye movements (nystagmus) are produced and measured using a nystagmograph. The procedure may also be referred to as caloric reflex test, and is typically used for assessing a patient's balance system and/or to test for brainstem death. It typically consists of an irrigation system that includes a pump, valves, heaters and regulators to control the rate of flow and temperature of the medium. This device is typically used in an ear/nose/throat (ENT) department.