Two types of balances, beam balance and spring balance are commonly used for measuring weights in shops. If we are on the moon we can continue to use:

If we were on the moon, we could continue to use the spring balance for measuring weights, but the traditional beam balance might not work as effectively due to the differences in gravitational force.

The reason we can use the spring balance on the moon is that it measures weight by the extension or compression of a spring, which is directly proportional to the force applied to it. While the gravitational force on the moon is about 1/6th of that on Earth, the spring balance can still function and provide accurate measurements. It will simply display lower readings compared to what we would get on Earth, but the mechanism will work correctly.

On the other hand, the traditional beam balance relies on comparing the gravitational force acting on the two pans of the balance. The beam is balanced when the torques on both sides are equal. Since the gravitational force is much weaker on the moon, the beam balance wouldn't provide accurate measurements unless it was specifically designed or recalibrated for lunar use.

In summary, the spring balance would be the more practical choice for measuring weights on the moon, while the beam balance may require modifications or would be less useful in this low-gravity environment.