Beam Balance!

One of the defect which may be present in a beam balance used in the market is different arm length.

It may be personally made by put a magnet under the weighing think etc.

beam balance's weight can be made of different measure by using magnet in it.

Cheating is often done by pasting some magnets and other things under the balance.

I think these defective balances really makes a huge differences when it comes about measuring quantities and very often customers are cheated by shopkeepers. So be careful friends and keep an eye on this balances whenever you are buying something...