whats a good scale for weighing arrows and broadheads ?

Alot of the digital powder reloading scales work real well. You can get them from cabelas or midway usa.com. It will cost you about 80 to a hundred bucks.

Their are many options, I find my balance scale is more dependable it does not drift, but since you might not care about 1 or 2 grains the digital may work well for you.
http://www.rightonscales.com/web/reloading/
http://www.riflemagazine.com/catalog/detail.cfm?productid=396&subcategoryid=36
Lee

I got a nice little digital from Cabelas for about $30 that weighs in grains grams ect. It even has a tare feature so you can take a small block of wood, carve a "V" along the length to put your arrows in so they don't roll off the scale. Once you put the block on it, you push the tare button and scale goes back to zero. It's plenty accurate enough.