This measurement can be made either with the steel ruler or with the magnifier; but ... The best way to do this is to position the long zero line of the magnifier scale on the left edge of groove 3 ...

Once the scale of the map is known, it is possible to measure the distance between two points. The easiest way to do this is to measure the straight-line distance using a ruler, then convert it ...

A brief exploration of different rulers and their uses. The other day, I answered a Facetime call to find a piece of raw meat ...

which is long in wavelength (and thus less accurate than light as a measuring tool). But if you are wondering what the insides of a CPU look like, right down on the nanometer scale, then check out ...

This measurement can be made either with the steel ruler or with the magnifier; but ... The best way to do this is to position the long zero line of the magnifier scale on the left edge of groove 3 ...