Here is still another (think I counted 8) level for your WP7 phone. This one, by LukasM, is a little different as it includes a hold feature and provides a history of your measurements. Also, it looks like you can pinch zoom the level, to get a closer look.
Take a look at the video below or you can find the app for .99 in Zune Marketplace here.
Note, you need Zune installed in your PC for the link to work.