pop-test
http://www.flickr.com/photos/learnsax/8430454427/in/photostream/
http://farm9.staticflickr.com/8360/8430454427_e4808a54a0_m.jpg
Check for leaks by using a pop test. Seal the Mouthpiece with the palm of your hand. Suck the Mouthpiece the reed will close creating a vacuum.
Pull your hand away and listen to the pop like a cork out of a bottle.
Count the milliseconds before the pop.
Youtube video by kcandfen. About Music Education For All.
http://www.youtube.com/v/siNg_mrkjIM