1: buy inductors with colorcode
2: Use a tonegenerator and a osciloscope to calculate inductance : http://et.nmsu.edu/~etti/fall96/electronics/induct/induct.html
3: Build a L meter / Induction meter http://apexys-toan.blogspot.com/2011/02/ne555-based-inductivty-meter.html
Below i build the inductance meter found at apexys-toan blog.
The schematic is borrowed from the projects homepage, hope this is ok, I will remove the schematic immediately on request from the author.
coil color code
In the original project a 40uA / 2500 ohm meter is used, my meter is 100 uA and 1000 ohm, and works well. I am not sure how to calculate the scale. I found tree inductors vwith colorcode on and plottet them into the scala. I have desided to buy cheap small inductors in different values, to calibrate the scale.
The ne555 at work
This is the induction meter, maybee i will put it into a box ;)