I have two scales. They cost me £10 each.
One does up to 300gram in increments of 0.1 gram, this is for silicone and larger resin pours.
The other does up to 50gram in increments of 0.01 gram, which I use for silicone catalyst and resin pours less than 20grams..
On the shopping list is a set which will do up to a kilogram in 1g increments, for silicone pours of more than 300 gram..
Accurate scales are your friend
AH