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It is necessary because measuring tools help you measure the length of an object accurately.
Micrometers
Rulers? .... :]
A measuring jug?
What tools would the tailors use in colonial times? They would use scissors, needle and thread and measuring devices, such as rulers, measuring tapes, etc. .
today doctors use tools such as amniocentesis and karyotypes to help detect genetic disorder.
Leeches and lances.
forceps
There are many instruments (tools) used for measuring. It depends on what you're measuring. A ruler can be used to measure length, a watch to measure time and an anemometer for measuring wind speed.
Measuring tools: Ruler or Protractor .
Doctors use math daily: - measuring height and weight (percentages, ratios) - measuring blood pressure and heart rate (fractions) - measuring dosages of medications - measuring levels of blood, urine, saliva, or other samples
Laser measuring tools are easier and quicker to used than rolls of measuring tape. One also does not need to use a pen and pencil to mark measurements.