SuperRuler might sound like the latest piece of kit for a mathematical action hero but rest assured, it's all really straightforward. At its simplest it's a ruler on your PDA, but also packed in is a protractor and a remote measuring tool meaning that you can measure the height of a dog, a young boy, a building or whatever you want really.
Be warned, to do this you will need your GCSE Maths and a rudimentary understanding of trigonometry. I skipped over this due to a sudden fit of nausea.
The trial is limited due to registration codes and there's only so many centimetres you can fit on the screen of a PDA, and even fewer inches.