No the Thermometer is nearly full due to the complexity of the gadget. Not how high it goes. The height is limited by the "box" you are in when you make a level. The Thermometer goes up based on the number of items in your level, as well as how complex they are (complex as in surface area). So, in turn building the calculator WILL take up all your space, unless you can find a way to make it less complex.

Also certain objects take up more space, and switches are one of those objects that take up a good bit (The emitter takes up the most, you can only fit less than ten if I recall when I was testing the size limits). That one has quite a few switches linked and such.