Babban dakin gwajin zafin jiki da ƙarancin zafi, wanda kuma aka sani da ɗakin gwajin muhalli, ya dace da samfuran masana'antu, babban zafin jiki, gwajin amincin ƙarancin zafin jiki.Don injiniyan lantarki da lantarki, motoci da babur, sararin samaniya, jiragen ruwa da makamai, kolejoji da jami'o'i, sassan bincike na kimiyya da sauran samfurori masu dangantaka, sassa da kayan aiki a cikin yanayin zafi mai zafi, ƙananan zafin jiki (m) canje-canje na cyclic a cikin halin da ake ciki, gwajin gwaji. alamun aikin sa don ƙirar samfur, haɓakawa, ganowa da dubawa, kamar: gwajin tsufa.