Changing nozzle size?

[EagleSeven]

Sometime nozzles are Not exactly the size they are supposed to be,
We measure the nozzle opening under a microscope using mm size drill-bits.

Those tiny drill-bits are not much good for drilling, since they brake very easy,
but are good for measuring nozzles.

(Do Not try to drill out a plugged nozzle with them)

We found a set of the various sizes needed at eBay.