Press the elevation button labeled "Elev" and then the "Jog" button with the upward and left pointing arrows, to raise the blade to the top. Then press the "Jog" button with the downward and right pointing arrows to pull the blade down a fraction.
Press the "Bevel" button and place the square against the top of the table and the left side of the saw blade. Then press the upward pointing "Jog" button and the downward pointing "Jog" button until the blade is square.
Press the "Elev" button and lower the blade with the downward pointing "Jog" button until the blade is below the table top. Press the upward pointing "Jog" button until the tip of a saw tooth is even with the table top. Then press the "Cal/Enter" key. The display will show a series of zeros which are zero elevation, and the calibration of the saw blade height will be complete. Now when you raise the blade, the height will be correct.