Move the object to a new world and watch the spring scale: its weight changes with gravity, but its mass stays exactly the same everywhere. That's W = m · g.
Mass m
50 kg
the same on every world ✓
Weight W = m · g
490.5 N
Earth · g = 9.81 m/s²
On an Earth scale
50.0 kgf
what a kitchen scale on Earth would read
Mass50 kg
Choose a world
Custom gravity g9.81 m/s²
Notice the mass never moves when you change worlds — only the weight does. Drag custom gravity to invent any world you like.