Pair of laser wheel sensors for the RailBAM Acoustic Bearing Monitor

Pair of laser wheel sensors for the RailBAM Acoustic Bearing Monitor
View full size photo (1024px by 683px)

Taken with a Canon EOS 50D
Date: December 30, 2011 13:00 PM
Exposure Time: 1/500 sec
Aperture Value: f/11
Focal Length: 32 mm