An apparatus for use with a compact self-leveling construction laser for the purpose of allowing the user to remotely call or page the measurement beam to his location using a retroreflector. The apparatus uses an auxiliary plumb beam provided by the construction laser for scanning the job site in search...http://www.google.com.au/patents/US5610711?utm_source=gb-gplus-sharePatent US5610711 - Remote pointing system for a self-leveling laser instrument
