The precision of a measurement tells you how close two or measurements of the same quantity are to each other.

For example, if you weigh the same object five times and get the same measurement of \(1.2 \text{ kg}\) each time, then your measurements are very precise.

However, if you get five different measurements, like \(1.2 \text{ kg}\), \(1.5 \text{ kg}\), \(2.4 \text{ kg}\), \(0.7 \text{ kg}\) and \(1.1 \text{ kg}\), then your measurements aren't very precise.