I weigh my Protein Powder on a digital food scale. Just seems more accurate that way. I also measure my chicken breasts (raw), red meat, and everything else.
I'm far from a national competitor so I'm EXTREMELY anal.
Right now I'm trying to find something that I can use to measure my bulk powders (K-rala). I'm just not comfortable guessing on amounts. I dont want to short change myself and I also dont want to waste product.