DIY Keif Screen Micron Question.

what gauge of mesh should i use? (how many Microns?)
recently found different size mesh from 20 Micron (VERY small) to 500 microns (pretty big)
im not sure which size i should buy, i have a store bought keif box but it is too small for my needs, and when i bought it i asked how many microns the screen was, but the clerk was unsure.
i was kinda thinking 90 microns, just by feel though.
im sure someone knows
thanks guys.

The smallest screen in my bubble bag set is 25 micron but I get very little from that screen.
I get the most heads from the 75 micron bag and toss the stuff from the 120 bag so I would say 90 would be a good size.

Yeah I used to use 80 and it worked fine. 90 sounds like it would be a good deal.