Power on the machine with your Haas Control Key.
Set the grid offsets, refer to NGC - Axis Grid Offset.
Push [ZERO RETURN].
Place a tool holder into the double-arm.
Mount a 0.0005" indicator  and mag-base to the machine table.
Place the indicator tip on the bottom  of the toolholder .
Set the indicator to 0.
Jog the table away from the toolholder.
Do not move the indicator.
Move the toolholder from the double-arm to the spindle.