Munchkin Pathfinder Kill-o-Meter - Rules of Play says:

The best Munchkin fights are the ones where everyone plays cards to keep the levels bouncing up and down! But it can be hard to keep track. Now you'll never have to stop and recount again! With the Munchkin Pathfinder Kill-O-Meter, whenever a card hits the table, you turn the dials to keep track of your new total. You don't have time to stop and count when the goblins are on your heels! The Munchkin Pathfinder Kill-O-Meter also comes with four special Munchkin Pathfinder bonus cards, and it's all illustrated by Lar deSouza! So watch out for goblins and find the quickest path to Level 10 and victory!