Universe Today
“The penlight which you have supplied for the Apollo missions has been very useful and dependable in all missions to date. However, you deserve special praise for the role it played on our mission - Apollo 13. As you know, due to the explosion, we were forced to ration our electrical power and water. With regard to the former, we never turned on the lights in the spacecraft after the accident. As a result your penlights served as our means of "seeing" to do the job during the many hours of darkness when the sunlight was not coming through the windows. We never wore out even one set during the trip; in fact, they still illuminate today. Their size was also a convenience as it was handy to grip the light between clinched teeth to copy the lengthy procedures that were voiced up from Earth.”