I.Selelekela sa Sehlahisoa:
Sehlahisoa se na le motheo oa sampole le litlhaloso tse leshome tse fapaneng tsa boholo ba poleiti e bohareng, tse loketseng botenya ba sampole (0.1 ~ 0.58) mm, kakaretso ea litlhaloso tse 10, tse nang le lipoleiti tse fapaneng tsa bohareng, li ka ikamahanya le botenya bo fapaneng ba sampole. E sebelisoa haholo indastering le mafapheng a ho etsa pampiri, ho paka le tlhokomelo ea boleng ba sehlahisoa. Ke sesebelisoa se khethehileng sa ho leka matla a khatello ea lesale la pampiri le khateboto.
u Nomoro ea 1 0.100-0.140 mm
u Nomoro ea 2 0.141-0.170 mm
u Nomoro ea 3 0.171-0.200 mm
u Nomoro ea 4 0.201-0.230 mm
u Nomoro ea 5 0.231-0.280 mm
u Nomoro ea 6 0.281-0.320 mm
u Nomoro ea 7 0.321-0.370 mm
u Nomoro ea 8 0.371-0.420 mm
u Nomoro ea 9 0.421-0.500 mm
u Nomoro ea 10 0.501-0.580 mm