I.Iṣafihan ọja:
Ọja naa ni ipilẹ apẹẹrẹ ati awọn iwọn iwọn mẹwa ti o yatọ si ti awo aarin, ti o dara fun (0.1 ~ 0.58) sisanra mm ti apẹẹrẹ, apapọ awọn alaye 10, pẹlu awọn awo aarin oriṣiriṣi, le ṣe deede si oriṣiriṣi sisanra. Ti a lo jakejado ni ṣiṣe iwe, iṣakojọpọ ati abojuto didara ọja ati awọn ile-iṣẹ ayewo ati awọn apa. O jẹ ohun elo pataki kan fun idanwo agbara funmorawon oruka ti iwe ati paali.
u No.1 0.100-0.140 mm
u No.2 0.141-0.170 mm
u No.3 0.171-0.200 mm
u No.4 0.201-0.230 mm
u No.5 0.231-0.280 mm
u No.6 0.281-0.320 mm
u No.7 0.321-0.370 mm
u No.8 0.371-0.420 mm
u No.9 0.421-0.500 mm
u No.10 0.501-0.580 mm