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.
Includes clip, stand, magnet and hanging hole for ease in use
AAA battery included
2.5" x 2.5" x .5"
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
For the model #4007 the battery is a MAXELL 303 SR44SW.