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Welch Allyn SureColor™ LED lamps come standard The most durable pocket-style otoscope on the market1, designed to hold up through your training and into practice Lightest-weight Welch Allyn otoscope, for the comfort and control you need Fiber optics provide cool light with no reflections or obstructions Features 6 lumens for 2X the light intensity Comes standard with matching color and vanilla accessories 1Based on rigorous drop test versus leading competitors More Info Total Height 16.8 cm Head Width 3.0 cm Head Depth 5.1 cm Handle Diameter 2.1 cm Weight Head and Handle (no batteries) 2.53 oz (71.7 grams) Battery Type AA Alkaline x 2 Battery Life >5 hrs Lamp Type SureColor LED Lamp Life 10,000 to 20,000 hours Light Transmission Fiber Optic E5ciency (lumens/watt) 10.3 Magnification Power 3.4X Diopter 13.6 Working Distance w/Specula (visual, best focus dist) 6.5 mm from 4 mm speculum tip Resolution w/Specula (visual, lp/mm) 3 - 6 lp/mm at working distance Depth of Focus w/Specula (visual) 0 to 11 mm from speculum tip Focal Length 73.45 mm (2.9 in) Field of Illumination/Distribution at FO 34.1 mm @ 50 mm distance from tip UV/VIS/IR at FO (% from SPD, Optronic) 0%/99.47%/0.53% Total Flux at FO (lms, Andor) 3.62 lumens Intensity as FO (lux, FC, UDTS370/263 photometer) 1540 lux with 4 mm specula User Contact Temperature 10°C over ambient max Pneumatic Otoscopy Port Yes Pneumatic Otoscopy Seal Yes