Final answer:
A balance would give the same mass reading on the moon as it does on Earth because it measures mass, not weight, which changes with gravity.
Step-by-step explanation:
The balance would give the same value for mass if used on the moon because balances measure mass rather than weight. Mass is a measure of the amount of matter in an object and does not change regardless of location. Weight, on the other hand, is the force exerted on that mass by gravity. On the moon, gravity is approximately one-sixth that of Earth's, so an object would weigh less, but its mass would remain unchanged. Balances, which compare masses, as in a lever balance, would show the same mass on the moon as on Earth.