Use two of the indicators to quickly and easily set the Plate in the level. The tilt of indicator of 1 mm corresponds to the height of 0.17 mm. With ease you set the height to an accuracy of 0.08 mm.You will need two level indicators. 1) Print two. 2) Assemble the arms. Use two nuts on each screw. Warning: The lower arm (arrow) has slightly and freely move.Both indicators must show exactly the same value. They must be calibrated. Install one at any point on the X axis. Set X-axis height so that the arms indicator are parallel. White pen mark level of the arm and remove it from the X axis. Then, without changing anything, the second indicator mount exactly the same place. Mark level of the arm and remove it from the X axis. Ok, now both indicators show the same height.