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A ruler or tape measure.
depends on what item you are measuring
The answer depends on what characteristic the tool is used to measure.
You need different tools these measurements. For mass you want a scale or balance. You can only use the same tool for length and volume (a ruler, caliper or similar) if the object you are measuring is a well defined solid with known geometric shape. Otherwise you will have to perform a measuring experiment for example put the object you want to determine the volume of in a graduated cylinder, pour a known volume of liquid into the cylinder, read the volume and subtract to determine the object's volume.
Use a string: put your finger where the string is at the edge of the object, then use a ruler to measure the tip of the string to your finger. Or use a protractor: each degree equals 1/16 of an inch.
A ruler can be very helpful.
ruler
A ruler or tape measure.
a ruler is something that measures the length of an object
scale
SI UNIT Usually, at a normal classroom size, the tool to use would probably be to measure it in either yards or meters. TOOL A yard stick
If you want to measure the length, use a ruler.
a scale or a balance
the tool of length is a RULER!
A strain gauge.
Make sure you have an accurate measuring instrument - ruler or tape.Make sure that you start with the zero point on the measuring tool exactly in line with the start of the object whose length you wish to measure. Ensure that you do this when viewing the two at right angles rather than from one side or another. Make sure that the measuring tool does not slip when you move tp the other end of the length. Again, make sure that you view the object and measuring tool dead on and read the measurement which lines up with the object.
A balance is the correct tool to use to find the mass of an object.