This timer from Westbend is the perfect size for cockpit use. It times up and down, and has a large, easily readable display. With a clip on the back for mounting on a kneeboard, and includes battery. The hang card makes it easy to display, too.
Counts up to and from 100 hours
Includes clip, stand, magnet and hanging hole for ease in use
AAA battery included
2.5″ x 2.5″ x .5″