I'm looking for a good Hardware Monitor Calibration Tool

@JGiunta Have alook at the Display Pro range from Calibrite, good above entry level kit

I hope this helps

neil barstow colourmanagement - adobe forum volunteer,

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I bought the Datacolor Spyder X Pro, but it doesn't seem to work with the latest MAC IOS

The Spyder X Pro is compatible with the latest macOS 15 Sequoia according to the specifications on the website. What problem are you having?

Spyder X Pro macOS – Datacolor Spyder

Operating System Support
OSX 10.14 and later (Mojave through macOS 15 Sequoia)

Mac's built-in Display Calibrator Assistant.

3rd party DisplayCAL or Pro Display Calibrator.

https://support.apple.com/guide/mac-help/calibrate-your-display-mchlp1109/mac