As mentioned, I moved recently to a more economically friendly environment. Part of the package of the cost savings happens to be, uneven floors. Not a major hassle until one wants to weigh oneself. I get different readings depending on which direction the scales are placed. I then take four readings and factor the mean.
But it's not as easy as it sounds. A movement of a few inches in any direction, even when the scales are facing east (for example) can make the scales read a two pound difference. Until I effectively resolve the precision I will estimate my current weight to be 240 pounds.