I have been dedicating a lot of tool expenditure on measuring and marking. I'm a great fan of drafting by hand which was discovered while I was at university, so I have a nice collection of drawing instruments...It's actually a bit of an obsession of mine.
Anyway. Talking pencils I use Staedler Marsmatic 2mm clutch pencils with 2H or H lead depending on the darkness/hardness of the wood I'm working with. I sharpen these regularly with the proprietary barrel-type sharpener and get a lovely fine point. I also use Staedler Mars Lumograph pencils in 3H when working with MDF or ply, I find the business end is a bit more resilient for those sort of tasks. I also have a wonderful Koh-i-noor 'Versatile' 6mm clutch pencil with 4B lead for marking face/edge/fibre direction marks. Big juicy black graphite which doesn't score fine surfaces, it's a favourite!!!
I have small and large Blue Spruce marking knives (in African Blackwood if you are interested
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) and a small and a large X-Acto knife for fine joint marking.
For measuring I use a stanley tape for rough stuff, and Fisher and old Starrett rules for fine work. I really need some longer ones though... a 600mm and 1000mm would be ideal.
I also have a set of Groz engineers squares from APTC which I think are great, a fisher combination set and a Nobex Quattro and as well as a couple of cheap tuned up gauges I own a Veritas micro adjust wheel-gauge and a wonderfully extravagant Glen-Drake 'Tite-Mark' which is just awesome.
I bought a couple of Shinwa all-metal sliding bevels from APTC which are really handy and a Veritas Metric Bevel setter which has been worth its weight in gold for doing traditional pitched roofs.
Sorry for the ramble.
Andy.