Basic Bayani:

An yi wannan na'urar bisa ga buƙatun GB2099.1-2008 da IEC60884-1: 2006 Article 25.4 (Figure 38). Ana amfani da shi yafi don kimanta zafi da matsin lamba juriya kayan aiki a cikin dumama yanayi. Na'urar ta ƙunshi abubuwa biyu na ƙarfe, kowannensu yana da cylindrical surface tare da radius na R25mm. A cikin wani gwajin yanayi (yawanci a cikin yanayin zafi mai zafi na 80 ℃ ± 2 ℃), ta hanyar sanya nauyin 20N a kan abubuwan da aka gwada ta hanyar kayan da ke sama, samfurin bai kamata ya bayyana a daidaitaccen ma'anar lalacewa ba bayan sanya matsin lamba na sa'a daya.