Addendum to the Simon's post:

• As shown in Fig 3, the vertical ruler shows 4mm when the tip is touching to the top of the black bread board, so we need to subtract 4mm from each read shown by the indicators.
• The numbers to be read are not the red lines on the vertical ruler, but the numbers shown by the indicators, as the one which is pointing the red laser lines is the tip (Fig 4 and 7).
• Fig 5 shows the "seems-not-to-have-pitching" side (where Simon was standing; minus X). The other side, where Yano-san was standing (plus X side), there seemd pitching (the rear edge of the WAB seemed "slightly" down.)