In fact the iTapemeasure system consists of an aluminium case which includes a built in 1.5 meter tape. Instead of trying a manual readout like the average tape measure, the iTapemeasure works with your iPhone to give you a large font digital readout and the opportunity to take pictures of what you measure.
Using iTapemeasure gadget you will not have to worry about scribbling measurements onto different pieces of paper, you will see better the results and the pictures of it.
The designers of iTapemeasure have built several prototypes, only the latest fits the iPhone 4. Tape measure is based only on the metric system but with plans for an Imperial version for United States.