Bests & Worsts Reviews from Amazon

This scale constantly gives me different readings. For example: If i put the scale down, let it zero, then get on and weigh myself i can weigh 196.2. Then i pick it up and move it to another area of our wood floor(all flat!) i get 195. I have had up to 4lbs off just by picking it up and moving it a few inches away to get a secondary measure. I cant trust the readings! How do i know which one is right. Disappointed in this product and will be returning it.