A measuring tape device with illumination function comprises a casing; a measuring tape received in the casing; an illuminator having a switch and an illuminating unit; the switch serving for actuating the illuminating unit; the illuminating unit being installed at a lateral side of the casing and near...http://www.google.es/patents/US7536804?utm_source=gb-gplus-sharePatente US7536804 - Measuring tape device with illumination function
