Range becomes larger. While we haven't tried it, you could probably stop the switch from closing until you had 15 to 20kPa of pressure. Note,however, that the rubber diaphragm isn't designed to withstand these. Pressure levels, so there may be some long-term reliability problems. So what uses can be made of these switches? That depends on your imagination, but here are some suggestions:
Providing water level indication eg, by using a dishwasher pressure switch to activate LEDs or lights to indicate the water level in a tank. By using two dishwasher switches and adjusting their individual set-points, it's easy to have six levels indicated. However, you'll need a lot of wires to connect the switches to your display.