.1 grams is a 10 milligrams. Thats plenty accurate for transdermals. You only need the $100+ scale if measuring small quantities of methyls where you'd actually need to weigh out 1mg, etc.
I got the Lucky 11 scale (non digital) for $12. The plate only holds 2-3 grams of most powders, making it a pain in the ass to get 15g measured for a transdermal. It'd be good for small amounts though.