Will not hold a zero - Lyman Pro Touch 1500 Elec Scale

I Ordered this to replace my traditional balance beam scale that I have been using for 40 years. Sadly, this scale will not hold a zero. I followed the instructions to the letter repeatedly across multiple attempts. Once it said "pass" on its zero routine I placed the pan on the scale to arrive at the pan weight. I zeroed the scale then proceeded with measuring powder at a desired 5.5 grains. Upon removing the pan, I noted that the original pan weight was different and fluctuating by varied tenths of a grain. Both up and down. I spent probably 2 hours through trial and error in establishing a common pan weight with the scale then proceeded with my powder weight mentally adding or subtracting the weight difference of the pan. When you remove the pan the scale displays the pan weight as a negative number. I found variances as much as 8 tenths of a grain. Using fast burning powder this can result in a problem if unchecked. I used the scale over multiple loading sessions with the same result. Not only frustrating and time consuming to arrive at a usable number, but potentially dangerous. I have had good luck with the Lyman products until now. Maybe this was a one off, but I give up. I returned it to Optics at my return shipping expense, in spite of it being a defect.