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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
Measuring tools: Ruler or Protractor .
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.
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.