On Mon, 25 Aug 1997, Tim Kerby wrote:

> Hi
> Most scales use a device called a load cell which is like a Z shaped chunk
> of metal that gives an output proportional to load.

PTM: Most cheap letter scales use counter, spring, coil and a magnet. A
coil and a magnet from a bass loudspeaker makes a good scale 0..200g.
Of course you can alleways use lewers as they use in the bathroom scales
to make this 0..200g -> 0..200kg.

Another way is to use this thing that I used as a pressure meter:
I had a moving foil and a HEDS1000. I read the the light that reflected
from the foil. It was _sensitive_ when you selected an EU-normal condom as
a foil

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PTM, pasi.mustalahti@utu.fi, ptmusta@utu.fi, http://www.utu.fi/~ptmusta
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