There are several ancient and modern tools that can be used to measure distance. Ancient tools included body parts like feet, fingers, cubits, and spans. Modern standardized units of measurement were developed including meters, centimeters, millimeters, and kilometers which are related and can be converted. Common tools for measuring length include rulers, tape measures, micrometers, odometers, satellite/laser range finders, measuring wheels, calipers, and curvimeters - each suited to measure certain distances accurately.

2. >
> And to measure distance, you have to use appropriate
tools.

3. ANCIENT TOOLS FOR MEASURING DISTANCE
length of actual foot, width of a finger, and
the distance of a step
– used distance from a person’s elbows to
his/her fingertips as a cubit measure.
– used distance from the tip of their thumb to the tip
of their index finger, which have been stretched apart, to
measure things, and they called this measure a lick.
– expressed length in span, which is the
length of a hand stretched out. A yard was originally the
length of the belt of an average adult male.

4. The International System of Units
Another units are centimeter (cm), and millimeter (mm) –
less than one meter. Kilometer (km) – exceeding one meter.
The following shows how the units are related to each
other:
1 meter = 1000 millimeters = 0.001km
1 meter = 100 centimeters
1 centimeter = 10 millimeters = 0.01 m
1 kilometer = 1000 meters = 100, 000 cm

5. Conversion From One Unit to Another:
Ex:
1. 3 m = ______ cm
3 x 100 = 300
3 m = 300 cm
2. 2.5 cm = ______ m
2.5 x 0.01 = 0.025
2.5 cm = 0.025 m
Ex:
3. 4 km = ______ m
4 x 1000 = 4000 m
4 km = 4000 m
4. 5.5 cm = ______ mm
5.5 x 10 mm = 55
5.5 cm = 55 mm

6. Tools for Measuring Length
A long and straight, and takes
measurements in inches, feet,
millimeters, and centimeters.
It may be made of wood, plastic,
or metal.
Meter stick – special ruler that is
exactly 1-meter long.
Yard stick – ruler that measures
nearly 1-meter long

7. 2. Tape Measure
Also referred as measuring
tape
A flexible ruler
Printed on a plastic ribbon
that can be used to find the
length around objects or the
distance along a wavy line.
It is frequently used in the
textile industry for taking
clothing measurements.

8. 3. Micrometer
Used to measure small objects
because it can measure lengths
within a quarter of a millimeter.
4. Odometer
Measures long distances such as highway travel.
Also called odograph, it indicates the distance
traveled by a vehicle, such as bicycle or an
automobile.
It is installed in the vehicle.
It can be electronic, mechanical, or a
combination of two.

9. 5. Satellite and Laser Range Finder
A high-tech equipment that are
used to measure distance over
long ranges, such as airplanes
and ocean liners.

10. 5. Measuring Wheel or Surveyor’s Wheel,
Click Wheel, Perambulator
– is a tool used to
measure distances.
Measuring wheels have
a counting mechanism
that counts the number
of rotations and uses the
circumference of the
wheel to calculate the
distance covered.
Measuring Wheel
Click Wheel

11. perambulator
An , also called a ,
meilograph, or map measurer, is an
instrument for measuring the lengths of
.
6. Curvimeter

12. 7. Caliper
A caliper - is a type of measuring tool that measures the
distance between two opposite sides of an object.
Calipers are meant for measuring thicknesses and internal
or external diameters inaccessible to a scale.