SST Mill Tram (1/2")

Can't read the dials with everything spinning so fast--I'm worried this will fall out of the chuck and fly across the room! Engine timing strobe?

Is the 1/2” center pin removable ? Either threaded or pressed on? I would like to use a 1/4” pin also to use on different machines . I can make 1/4”

where is this made?

Descriptions says that each graduation is 0.0005" but some pictures show 0.001" - Which is it?