Main siffofin firiji kofa sauya:

The kayan aiki ne yafi amfani da tsufa gwajin firiji kofa sauya, kyakkyawan bayyanar, sauki aiki da kulawa; Kowane motsi tsari m, aiki m, aiki abin dogara kayan aiki masana'antu ya dace da kasa dace ka'idodin: tsaro ƙarfin lantarki ya dace da GB3805 ka'idodin, inji kayan aiki kariya ya dace da GB8129 ka'idodin, muhalli tsabtace kariya ya dace da GB5083 ka'idodin;