ZCode MLB ERA Pitcher Oscillator is a very handy tool to look at a pitcher, where he is going, he is stable or not. Earned Run Average (ERA) is a metric designed to assess how well a pitcher has prevented runs in the past. Oscillator shows you changing ERA values of a pitcher in a form of an easy chart. Also you can compare ERA of two pitchers just by looking at the chart. To build the chart you can use various ERA types - ERA for season, ERA for last three games, ERA for all career. Choose game, or team (teams), pitcher (pitchers), ERA type value and GO!