Set Z / Set Z to zero
                                                    
                                                
Purpose: Use the Set Z or Set Z to zero button to manually set the current Z-plane value.
Typing in a value to set the Z position:
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 Click the Set Z button on the Move ribbon, Z Axis section. - 
                                                        
In the Current Z Position dialog box that opens, enter a new value, and then click OK.
The Z Meter will reflect the new Z position.
 
Use ALT+S to set the current position of the Z meter to 0.
Setting the Z position to zero:
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 Click the Set Z to zero button on the Move ribbon, Z Axis section. - The Z position changes to zero; this will be shown on the Z Meter.