One of the best things about the modern world is that you can have the gadget in your pocket for months or even years and still be surprised by the great little things it can do. This week it was the iPhone’s turn to make me sit down and say, “Hey, you’re a nice little boy, aren’t you?”

I will not pretend to you now everything I no longer know about this feature. But the pre-installed Measure app on the iPhone proved invaluable to me this week, and as a result I’ll be using it forever. This is because it is not only a quick tool for measuring things, but also doubles as a very accurate level.

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