What I've done to get a consistent .05 is
a: measure 1g, divide in 1/2 to .5, divide again to .25, divide in 1/5ths to get .05.
b. take a strip of alumnium from a can. Indent a little bowl in it using a round tip finishing punch and hammer just big enough to hold the result from step a. Then don't lose it, or you'll have to do all that tedious measuring again
Maybe not that precise, but does it really have to be?