I.Kuyambitsa Zogulitsa:
Chogulitsacho chimakhala ndi chimbudzi chambiri ndi mitundu khumi yosiyanasiyana ya mbale, yoyenera (0.1 ~ 0,5 ~ (0,5 ~ 0,5 ~ (0,5 ~) mm makulidwe, zokwanira 10, ndi ma mbale osiyanasiyana, amatha kuzolowera kukula kosiyanasiyana. Kugwiritsidwa ntchito kwambiri polemba mapepala, kuyang'anira ndi kuyang'anira kwapadera ndi mafakitale ndi madipatimenti. Ndi chida chapadera choyesa mphete zopatsirana ndi mapepala ndi makatoni.
U.1 0.100-0.140 mm
U.2 0.141-0.170 mm
U.3 0.171-0.200 mm
U.4 0.201-0.230 mm
U.5 0.231-0.280 mm
U.6 0.281-0.320 mm
U 4.7 0.321-0.370 mm
U.8 0.371-0.420 mm
U.9 0.421-0.500 mm
U.10 0.501-0.580 mm