Transistor matcher and curve tracer

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Latest project is as per title.
it is basically just an inverting stage where base vs collector voltages are measured and sent to pc via usb and displayed.
the curves can then be compared for a match.
the base voltage is a simple pwm into an integrator.
i use diff amps to convert between micro 3.3v and collector 9 volt supply and then back to 3.3v for a2d converter.
 
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Congratulations.

Paint one transistor red and paint another transistor blue.

Test each of them every day for 20 consecutive days. How much scatter do you see in the measurements of "the same device"? How much scatter do you see in the measurements of (red minus blue)?
 
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