precision instrument: caliper, micrometer
non-precision measuring instrument: your hand, a piece of string
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The precision is 0.05 metres.
measuring jug! kettle
To check the precision of an instrument its apparent measurement must be compared to a known measurement. The difference between the measured quantity divided by the known quantity is expressed as a % precision of the instrument, or calibration. Most instruments when being calibrated are tested against multiple known quantities throughout the range of the instrument. Thus the precision of the instrument is determined throughout it's full range of measurement.
measuring instrument
ruler