Microns are used for International Standard measurements.

2000 microns = 2 millimetres = approximately 1/12 inch.

Aperture in Microns	UK Mesh Number	USA Mesh Number	Canada Mesh Number	Germany Mesh Number	Size/Appearance
2000	8	10	10	-	En Tous Cas
1000	16	18	18	6	Eye of Needle 1230 microns
500	30	35	35	12	Builders Sand
355	44	45	45	-
250	60	60	60	24	Fine Sand
180	85	80	80	-
150	100	100	100	40
125	120	120	120	-	Fine Beach Sand
90	170	170	170	-
75	200	200	200	80	Cement
63	240	230	230	-
53	300	270	270	110	Tooth paste
45	350	325	325	-	Talc