Creality Ender Bed Gauge

Ender 3 Bed Gauge to be used to set all four corners of the bed to very close tolerances for quicker leveling. Insert the gauge between the bed and the main carriage, tighten the leveling wheels so that the gauge just slides out with a little resistance. Do this on all four corners and the bed should be ready to adjust your nozzle height.

I found when cleaning the bed, or changing the bed springs, this simple gauge allows for a very quick measurement between the bed and mounting carriage allowing you to set all four corners equal to each other.