Make a Balance Scale accurate to 1/2 gram, using a ruler and 2 old CDs

This is my first instructable.  The reason I made this scale is that I am a photographer and I mix my own developers using household compounds like instant coffee ( Caffinol---a future instructable) and I need to measure quantities as small as .5 grams.  The electronic kitchen scales are not accurate down to that level, so I decided to see if I could make a balance scale that would do the job.

Step 1 Materials and Tools

You will need a plastic ruler, 2 old scratched CDs (new would do but why waste them),  6  6" fishing leaders with snap ends,  2 small pieces of plywood,  long finish nails and some wood screws.  You will also need a drill with an assortment of bits, a pencil and a US Nickel.

Comments

[Computothought]

Cool.