The Neitz Halogen Medico Spot NTZ-MS-H is a high quality ophthalmic instrument featuring a lens system which projects a brilliant, highly focused, spot of light. The bright spot illumination is from diameter 40 mm to 100 mm at a distance of 150 mm. The illumination turns on by pressing the switch halfway. This penlight spot instrument measures 160mm long x 17.5mm diameter. The Neitz NTZ-MS-H Pen Light is supplied with two AA batteries and a spare halogen light bulb (L-64). An interesting and unique penlight, the NTZ-MS-H makes a great gift.