X-Ray Timer has been updated to Version 3.0 and is available in the app store.
The product page for the app with app store link can be found at the link below;
http://www.lancehenderson.com/x-ray-timer-app/
This version adds the ability to use SI units in addition to standard US units of measure.
Other improvements include visual and performance improvements, and retina graphics for the iPhone.
This version requires iOS 5.