I got a 100g scale with 0.01g increments for about $25 with shipping.
If you go to a bigger Coles and look in the kitchenware section you can pick up a Salter Slimmer's scale if you're lucky for about $10. That does 5g increments and is OK, however if you want something better have a look on ebay for some digital scales. I got a 100g scale with 0.01g increments for about $25 with shipping.
With variations in boil times, temperatures and wort densities there's a mile of error possible without wasting time measuring hops with a scale.
The only way i can think of is if you have a 90 gram packet divide it into 9
rook
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