Cassidy uses Laser Ranging Device in the aft FD during docking activities of Space Shuttle Endeavour

S127-E-006645 (17 July 2009) --- Astronaut Christopher Cassidy, STS-127 mission specialist, on Endeavour's flight deck, uses a range finding device to determine distance between the shuttle and the International Space Station during rendezvous and docking activities on flight day 3.