This is invaluable if you’re trying to measure something long and don’t have a helper to assist. What’s the difference between metric and imperial tape measures?

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Like other metric units, the new prefixes represent powers of 10 — just as 1,000 grams of mass, or 10 x 10 x 10, or 10 3, is a kilogram, and 1/1000 of a meter in length, or 10 -3, is a millimeter.

Other units of measurement include doughnuts, elephant trunks, and Arnold Schwarzenegger's biceps.

You can also measure a person's seated height. You can switch between imperial (feet and inches) and metric (centimeters) in the Settings app under Measure → Measure Units.

The tape measure is a simple but essential tool. On the face of things, it seems easy enough to use—pull the tape out, take a measurement, or make a mark for a cut. But there are some specific ...