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@freezing77
Most if not all digital calipers do both.
Alternatively if your do not stick some internal calipers inside the post then measure those.
If this is not suitable and you wish to measure a long way down get a bore measuring micrometer. (not cheap)
Or these.
http://www.ebay.co.uk/itm/like/231260510161?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=108&device=c&adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0&ff12=67&ff13=80&ff14=108