tension load cell

Dear All ...

I need to build kind of infusion bag/bottle monitoring.
My approach is to monitor it's current weight, and let the host pc to count it's current volume and maybe do some alarm scheme.

I'm searching the internet to look for proper load cell, and the best I found is some S-beam load cell ...but it's too pricy.

So .. anybody can tell me or better give photo on what inside a pocket fish digital scale ?

( http://images.bidorbuy.co.za/user_images/234/963234_110730114924_chinakangyu$101016657.jpg )

Sincerely
-bino-

You'll get a really cheap load cell.

Picture below; link to product: Boost - Buy In Coins

Chagrin:
You'll get a really cheap load cell.

Picture below; link to product: Boost - Buy In Coins

I really appreciate your help

Sincerely
-bino-