Ruler, yard stick, meter stick.
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Typically a tape measure would be used, but you could use a folding rule, a yard stick, or a simply ruler.
GPS Historically, the quadrant, and later the sextant were used to measure longitude.
Many different instruments measure losses depending upon the field. For example, reflectometers measure electronics losses and a manometer measures pressure.
A dosimeter is an instrument that measures the amount of hazardous material to which something or someone has been cumulatively exposed. The most common is the radiation dosimeter, which measures a person's or object's exposure to radiation.
A musical instrument is normally a human made device which when played produces an audible sound. The sound produced can be varied by the player and tuned to sound pleasant to the human ear. However, the term can also be applied to the trained human singing voice.