Lego can often be used to create many instruments that are expensive to buy or who will be used so little that the cost cannot really be justified. That's where creating an object like this Lever Arm balance - that really works is well worth it.
Lego do make one of these in one of their educational sets, but I just made mine from a collection of Lego that I had.
The lever is an example of a first class lever. The car wheel is used as the counterbalance. The balance can accurately weigh up to about 200g in this configuration. If another wheel is used then far more. In the 0-200g range the balance is accurate and quite sturdy. The scale was made from a piece of paper and calibrated using a series of known weights.
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