A measuring tape assembly includes a housing, a first level mounted on the housing, a second level mounted on the housing and having a direction different from that of the first level, and a scrolling tape rotatably mounted in the housing. Thus, measuring tape assembly can be used to adjust and calibrate...http://www.google.es/patents/US20040237326?utm_source=gb-gplus-sharePatente US20040237326 - Multifunctional measuring tape assembly
