My lab students had to make videos demonstrating proper use of an analytical balance. Most of the videos simply follow the minimum requirements, but this one is a gem!

http://www.youtube.com/watch?v=GlUxYJ-W7vA&feature

I had never seen a silent movie video of an analytical balance before!


This one is simply great. It's very well put-together and could be used in a classroom setting:

http://www.youtube.com/watch?v=mrm5sLPhBvY


This type of assignment is tedious to grade, but all the students learn proper use of the equipment. I definitely recommend this to a teacher who is willing to spend double the time grading.