Nau'in PN counter na nau'in DC shine na musamman mafita don gwajin fitar da ƙwararru. An ƙirƙira shi musamman don gwada ƙima da lambobi a tashoshin dubawa da benci na gwajin injin. Samfurin ya ƙunshi ingantattun na'urori masu lura da barbashi a halin yanzu akan kasuwa, kuma duk abubuwan da ke cikin ma'aunin PN an haɗa su tare don tabbatar da daidaitaccen aiki na na'urori masu auna firikwensin ƙarƙashin kowane yanayi.
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