I know you said you didn't want a battery operated set but seriously, they're really good and the battery lasts ages...mine is years old and I've only replaced the battery once.
It's a basic Salter set, cost about a tenner, very slim and takes up no room in the kitchen, you can use any bowl or container with it.
It's just a suggestion, but why not spend a tenner on an electronic set and see how you go on. If you don't like it (but I bet you will) then you can always replace it with a more traditional...and expensive...set.