Is there a reliable Scale app for the ipod touch?

I'm looking for an app that isn't full of it that weighs in grams? On the "App store" most reviews claimed scams and none worked, I only searched the word "Scale" maybe there's one that doesn't use that word in the name? Just need a weight app that can measure out like 1-14 grams and smaller weights like that -- anyone know a good one that works pretty well? Thanks!--