A meter stick or a metric ruler is used to measure metric length.
there are many instruments used to measure length depending upon the size of object , Ruler is Metric instrument used to measure length. Screw gauge is also used as an instrument used to measure length in mm.
Tape measure. Ruler. Caliper. Micrometers.
The metric unit of length is the 'meter'.
A metric tape measure will do.
A metric ruler.
Meters is the standard metric unit of length.
The same as instruments to measure lengths in any other system: rulers, tape measures, range finders, and so on.