Metronom na'urar da ake amfani da ita a cikin kiɗa don alamar lokaci ta hanyar samar da tsayayye, bugun yau da kullun a takamaiman lokaci. Yawanci ya ƙunshi pendulum ko ma'adini crystal wanda ke jujjuyawa a ƙayyadadden ƙima kuma yana samar da sautin dannawa ko haske mai walƙiya a tsaka-tsaki na yau da kullun, baiwa mawaƙa damar ci gaba da ɗorewa yayin wasa ko waƙa. Ana amfani da ƙa'idodin ƙa'idodin ƙa'idodin ƙa'idar aiki a lokutan aiki da wasan kwaikwayo, musamman a cikin kiɗan gargajiya, inda takamaiman lokaci da ɗan lokaci suke da mahimmanci.