When it comes to dosing coffee, the ideal solution is always a scale, as the density of different coffees will vary. However, if you're on a tight budget, or need something portable, a measuring spoon is the next best option. This copper scoop from Hario is designed for use with their V60 Coffee Dripper and will provide ~12g of coffee beans per scoop.

Even if you don't use this measuring spoon to dose, it can be a handy way to scoop beans out of a coffee bean bag. It's very similar to the ones that come bundled with a Hario V60 Coffee Dripper but where those are plastic, this comes in copper.