The nanosecond conversion selector selects the time measurement unit to convert to starting from nanoseconds (ns). To make a conversion starting from a unit of time other than nanosecond, simply click on the "Reset" button.
The nanosecond is a unit of time in the metric system equal to one billionth of a second (1 ns = 10-9 s), the base unit of time in the International System of Units (SI).
One nanosecond (ns) is also equal to 109 attoseconds (as), or 1,000 picoseconds (ps), or 0.001 microseconds (μs) or 10-6 milliseconds (ms), which are SI units of time.
Times of this magnitude (i.e., on the nanosecond time scale) are commonly used in telecommunications, pulsed lasers, and electronics.