IMPORTANT MESSAGE YOU NEED TO KNOW BEFORE YOU WEIGH, PLEASE DO READ CAREFULLY !!! 1 . Please note: floor can't be carpet floor must be flat and hard surface, tile floor is the best ! wood floor and cement floor are ok. but, if the scale isn't accurate on them, please place it on tile floor and try again, because it's probably there's something wrong with wood floor and cement floor 2 . Only weigh after figure is zero a. step on the scale, and step off after light is on b. wait till figure is zero c. step on again, figure will flicer, wait till figure is stationary,figure at that time is your actual weight we ensure you'll get correct weight data as long as you do as the above. if you still don't think it correct, please do let me knowimmediately by sending me message in your Amazon account, and l'll refund you all you pay as soon as l see 3 . lf you move the scale, make sure the scale is still on flat and hard surface. again, make sure the scale is off before you weigh 4 . The scale has no switch of on/off, it'll be on automatically after you step on, and it'll be off automatically after you step off 5 . Please do install the lid of battery cabin well. if not, the scale will show wrong weight 6 . In some cases, there's error. error range is about 500g, we promise error is within it MISUNDERSTANDING : when you step on the scale and see your weight figure, you want to see if figure will increase after you pick up one item, unfortunately, you'll see figure is still same please don't think the scale inaccurate, because figure is locked at that time. if you want to know total weight, please step off; after the scale is off, step on; after the scale is on, step off; after figure is zero, step on and wait till figure is stationary, you'l see weight is more than before (pre-condition is this item is more than 50g) PLEASE IMMEDIATELY CONTACT ME IN YOUR AMAZON ACCOUNT IF THERE'SANY PROBLEM. BELIEVE ME, THIS'S THE BEST SELUTION, AND WE WILLSURELY MAKE YOU 100% SATISFIED IN THIS WAY !