Even some older film cameras have built-in light meters, but a handheld meter is ideal for the most accurate results. While ...

Below 3 Mgd, the meter accuracy diminishes. Additionally, different types of meters have different turndown ratios over their full range. It is common for a Venturi tube, for example, to have two ...

If you have an idea of what kind of data you’re looking to track (such as distance and speed for running or hours spent sleeping), check our table of contents of activity types to the left.