DIY turbidity meters

coming soon, first experiments running and are great...

simple laser absorbtion, easy detection of turbidity

UV-vis spectrometer, would be even nicer, added white LED instead of laser, changing colors with simple light filters. but they have almost no UV, so added a UV led. turns out the CdS photoresistors are really slow and not very sensitive at UV also...

turbidity to pd tools:

also we are working on a hacked line-scanner to look at the spectra after passing a prism or grating