Best to measure across the diameter , rather than holding the caliper slightly in front of one side. 
and try to get the measuring faces parallel to the centerline of the cue/ferrule.
http://www.ebay.co.uk/itm/snooker-cu...3D321818025583

and try to get the measuring faces parallel to the centerline of the cue/ferrule.

http://www.ebay.co.uk/itm/snooker-cu...3D321818025583

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