Halford's pencil type is accurate. I think it equalled the accuracy of a Snap-on one in a bike magazine test years ago.Anyone recommend a good quality accurate handy pressure gauge.
Mine is a inaccurate and also is known to give different readings within seconds!
Ooh yes, the valve core extractor, worth it's weight in gold, except it catches on the spokes when using it.Wot Yen sez.
The pencil type available from Halfrauds or good motor factors,sometimes under the Draper name in a triple pack with depth gauge and valve core extractor are pretty god damned accurrate as well as easily portable and difficult to damage.