What's the difference between beam balance and spring balance?

A spring balance will give a different mass reading on the Moon from that on Earth. A beam balance however, will give the same reading. Explain why.

Beam Balance:

Beam balance measures mass.

Mass is the amount of matter the object has.

The S. I. unit of mass is kg

Spring Balance:

Spring balance measures weight not mass.

Disadvantage: It requires gravity to measure.

The S. I. unit of weight is newton (N).

That is why when we are in outer space, we become lighter-there is less gravity!

Mass remains constant while weight is dependent on the gravitational pull of the planet. Mass only changes with a change in matter that results in a change of volume.

Mass remains constant throughout. Only weight changes with gravitational acceleration. Mass will only change with a change in the volume of matter in the body.