Bests & Worsts Reviews from Amazon

It's not stable while using the provide batteries. once I place my item on the scale, the number start decreasing, and when I take my item off, the number become negative (not 0.00 anymore). Using the power adapter, the number is stable. Update: still not stable, sometimes there was 10% difference between two measurement. And the number just won't stay put, keep jumping around. I want my money back.