That $12.99 scale will serve your purpose just fine. If it wouldn't, I doubt the Dr. would have given it to you.

In fact, you can find cheaper scales on Amazon that still work great. So don't let the price concern you. I've had a few of the cheap $10-$20 scales and they all were accurate.

The only pain is they don't come with the proper weight for calibrating. Once you have a calibrating weight for it, and do so, they will be plenty accurate for the small measurements you will be doing.

My current $12 digital is used sometimes as a double checker to my RCBS 10-10, and I've never had a problem with the two not agreeing with each other. I can put any gram weight piece out of my calibrating set on it, and it's dead on.