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+# D3D9 Monitor Check
+
+A separate application to run the infamous IIDX “monitor check” without having to run the actual
+game. The tool can be used to test measure the current avg. monitor refresh rate or debug/check if
+that value is fluctuating for some reason.
+
+The final avg. value that is provided at the end of the test can be used as input for other tooling
+or settings (e.g. patching charts to a different refresh rate on older games with bemanitools).
+
+Simply run the tool without any arguments to get a full synopsis with usage instructions.
+
+## "Accuracy" remarks
+
+The tool has been tested on an actual cabinet with `nvgpu` setting different custom timings. The
+accuracy seems to be even higher than what IIDX’s monitor check is actually showing. For example,
+with a custom timing of 59.900 hz, this tool yields fairly accurate and stable avg. 59.902 hz.
+
+The monitor check of IIDX 29 shows results of 59.8981 hz to 59.8997 hz on screen. As these are the
+only visible values to the user, determining a specific (avg.) value that can be used as input for
+other tooling or settings (e.g. patching charts to a different refresh rate on older games with
+bemanitools) is difficult. This doesn't mean that the game's monitor checks are actually
+inaccurate or wrong. Modern games with a built-in monitor check (starting IIDX 20) are syncing up
+fine and don't need any further patching or modifications.
+
+For older games, picking a value that is not as close as possible to an accurate avg. value can
+easily lead to issues with sync. So it's recommended to use the d3d9-monitor-check tool to get the
+most accurate value.