Weight and Mass

Mass: Is the measurement of the amount of matter in an object.
Weight: Is the measure of the gravitational forces in an object.

Differences:

The weigth depends on the location and gravitational forces of the place. For example: a ball on the moon doesn´t have the same weigth that it has on the Earth. This is because the Earth has 9.8% of gravity and the moon has only 3.6%.

Instruments of measurements:

Weigth: It is measured with devices such as the spring scale,shown below:

Mass: It is measured with devices like the triple-beam-balance. This balance compares an object´s mass to know standars of mass called countermass.