Excimer Laser Device (atopic dermatitis) is a recurring, non-infectious, inflammatory skin condition that affects nearly one third of the population at some stage of their lives. Affecting people of all ages and skin types, Excimer usually beings to appear in very early childhood and continues into adulthood characterized with acute red, dry, itchy and scaly skin that may develop into weeping, bleeding and crusting. The most severe forms of Excimer may include the infection of lesions leading on to long-term chronic inflammation. Excimer can appear anywhere on the face or body with unpredictable attacks that last with varying duration. This trainer is designed to demonstrate the operation, theory, repair and servicing of Excimer Laser equipment that used at clinics & hospitals. The unit is given the fault diagnosis so as to facilitate the teaching of trouble shooting techniques. A fault simulator is provided with circuit block diagram of the device for the students to study theoretically and experimentally in order to understand theoperation of the device.