The M48 probe accuracy test in Marlin firmwares tests the accuracy of your auto bed leveling sensor.
The BLTouch is advertised as having an accuracy of up to 0.005 mm (with some test results being on the 0.006 range) and the CR Touch is advertised as having an accuracy of up to 0.004 mm.
After running 3 tests, my CR Touch was between 0.002 and 0.0033 mm, being 2-3x more accurate than the BLTouch!

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