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Robots Glossary

OnTester Result

OnTester Result - A custom metric returned by an EA’s OnTester() function during optimization. It can be any user-defined value (e.g. a combined fitness score). MetaTrader optimization displays it as “OnTester Result”, often used as the criterion to maximize/minimize in optimizer. For instance, an EA could return its profit factor or Sharpe as OnTester, letting MT optimize for that metric. It’s specific to MT5 strategy optimization.