Ɗauki hanyar sharar mitar don auna halayen iska mai canzawa.
Lalacewar iska kamar murdiya, kumbura ko murkushe taransfoma da aka auna ta hanyar gano sifofin amsa mitoci na kowane iskar, ba buƙatar ɗaga shinge ko tarwatsewa ba.
Ma'auni mai sauri, auna iska ɗaya yana cikin mintuna 2.
Babban mitar daidaito, sama da 0.001%.