Cassidy holds laser range finder in aft FD during Joint Operations

S127-E-011291 (28 July 2009) --- Astronauts Tom Marshburn (left) and Christopher Cassidy, both STS-127 mission specialists, look through an overhead window on the aft flight deck of Space Shuttle Endeavour during flight day 14 activities. Cassidy is holding a handheld laser ranging device -- designed to measure the range between two spacecraft.