A currency examining system for detecting counterfeit currency. There is a magnifying device, substantially above the bill of currency being examined, configured to magnify the image of the currency; a transparent support member, substantially below the magnifying device, whereupon currency for examination may be placed; and a light unit, substantially below the transparent support member, configured to illuminate so as to show light through the transparent support member. Additionally there is a security mark index display, being configured to provide indicia of various security marks for determining authenticity of a bill of currency. The currency examining system also includes an adjustable frame member; a reflective member configured to reflect and direct light from the light unit generally towards the bill of currency being examined; and a control device in communication with the light unit, configured to control the intensity of light emitted from the light unit.