Solution: pressure sensitivie kitchen worktop that allows any part of the work surface to be used as a set of scales, without clearing the worktop. To use the scales, the user would place a container on the work surface and hold the container of food to be weighed out (e.g. a bag of flour). The user would press a button on a small display on the wall behind the surface (or another convenient location) to turn on and zero the work surface. The user would then poor the food into the target container, watching the display indicate the mass transferred.
Possible problems: spills will count towards the weight measured.