Medidores de vazão!

Diferencial de Pressão:

http://www.youtube.com/watch?v=kHpZN92V9JM

Eletromagnético:

http://www.youtube.com/watch?v=-XD0LmJyYJQ&feature=related

Ultra-sônico:

http://www.youtube.com/watch?v=68Q47lEcVgI&feature=related

Coriolis:

http://www.youtube.com/watch?v=7dp8PO-_BdA&feature=related

Térmico:

http://www.youtube.com/watch?v=tT0B0hwOMc8&feature=related

Vórtices:

http://www.youtube.com/watch?v=8b_CZiYZG2Y&feature=related