pH/PPM Meter - Window of oppertunity

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pH/PPM Meter - Window of oppertunity

Images of homebrew ppm/ph meter with serial and usb for loggin and setup. More details of the project itself can be found here. (clicky!)
Red filter glass pushed into the hole made. Fits nicely eh? There is no glue i just took alot of time measuring and cutting it nice tho is a bit of a bump at top. :/ Note no buttons yet...