Fiber Optic Illumination. Ensures homogeneous, bright exposure and an unobstructed view of the ear canal and tympanum. For the most secure fit, best light transmission and hygiene, we recommend the use of HEINE Otoscope Tips. Matte-black inner instrument head finish eliminates reflections. Special optical interface to precisely integrate the LED illumination with the optical system to ensure bright, homogeneous light during examinations. Exclusive continuous brightness control between 100% and 3% (patent pending) with one-finger operation. 3x magnification: The multi-coated glass viewing window offers high resolution and distortion free images. LED in HQ: The new standard in LED illumination defining optimal light intensity, homogeneity and colour rendering for the most accurate diagnosis. Red is red, blue is blue. Colour temperature: 3 500 K, Colour Rendering Index (CRI) > 97, special index for red colours (R9) > 93 on a maximum scale of 100. . The BETA 200 LED F.O. Otoscope has been designed with an all metal housing and a scratch resistant glass window. These high quality materials guarantee a lifetime of maintenance-free use. These high quality materials guarantee a lifetime of maintenance-free use.. The HEINE BETA200 (2.5 V) F.O. otoscope can be used with all HEINE BETA battery handles. How do I change the light source in my HEINE BETA200 F.O. Otoscope? Detach the otoscope from the handle and pull the bulb out of the guide tube of the connector plug holding it at the narrow collar..