Here is a picture of my scales. I weigh every morning when I get up but I don't obsess about it. If it comes off, good. If it doesn't, it will. If I'm naughty, I expect to see the penalty the next day. This is about the most accurate scale you can get without batteries or a wall plug! (If the planet's gravitational constant ever changes, expect to see major weight fluctuations, though!!)
Scales 
Linear Mode
