Could "1.9 pixel point" mean the tip is 1.9 pixels in size (diameter?)? If so, 1 inch = 72 pixels so 1.9 divided by 72 = 0.0264" or 1/38" For those more familiar with metric, 0.0264 X 25.4mm = 0.67mm or 2/3mm.
So if that is what they mean by "1.9 pixel point", it is very fine indeed.
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