I thought the 1.5kg bit meant it couldn't weight anything less than that (I tried with a 500g pasta jar and nothing) - not it could vary by that much
noo..
what i meant was write down your weight over the day. so take 5 or 6 readings. then chart them.
the highest and lowest values should be within 1.5kg's of each other. thats giving daily weight changes plus an addition error margin.
that was just a random error margin.
the bit you mention is that the sensor in the scales wont pick up any weight under 1.5kg as that isnt heavy enough to turn it on. it will pick up changes of 1.5kg over that weight. so once its on any change it will notice. thats just to stop random things falling on it and turning it on.