in my mage character i always use a quill an inkwell and parchment to wright what do i need to buy and well thats how i wright in my journal too, also a Hourglass to know what is the time and also my crystal ball.
in my Warrior i only use calipers, hammers pickaxes and tongs
in my Assassin i need always some ingredient that damage health kill and put in my target!also because he thinks that bring good luck!

And what about your characters what do they use?