CHY nau'in yumbu tubali dawo da coefficient gauge (a ƙarƙashin gauge) ne mai auna dawo da coefficient don ƙayyade daban-daban tubali juriya tasiri kayan aiki. Ana amfani da wannan ma'auni ne bisa ga bukatun GB / T3810.5-2006 "Hanyar gwajin yumbu - Sashe na 5: Tambayin juriya na tubali ta amfani da ma'auni na dawowa" da ISO10545-5: 1996 "Yumbu - Sashe na 5: Tambayin juriya na tubali ta amfani da ma'auni na dawowa", wannan ma'auni yana da sauƙin aiki, karatu mai sauƙi, samfurin da aka sanya a lokaci guda ba tare da buƙatar lissafi ba don karanta tsayi da mai dawowa. Ka sa φ19 karfe ball fadi daga 1m tsayi a kan samfurin da kuma auna da komawa tsayi tsayi, don haka auna dawo da coefficient.

Main fasaha sigogi:

Karfe ball bayani: φ19 ± 0.05 (mm)

Sauka tsawo: 1000 ± 1 (mm)

Wutar lantarki: AC220V 50Hz

Gidan girma: 500 × 400 × 1440 (mm)