if you buy scales you will get obsessed with them lol, i dont really reccommend the body fat ones, they rubbish, also i find the electric scales arnt very accurate,
( ive had loads of scales in the past)
my best by far is the doctor type scales, they are very accurate, these type..
I bought mine in Tesco for about £1.50 a while back. It's great for getting rid of lumps in shakes and you can just stick it in your bag for work or whenever you go anywhere