What is the mass and weight on earth?

The mass is physical quantity measured in kilograms, and the weight is a force measured in Newtons.

The weight depends on the mass of the planet you are standing on, and altitude. At sea level on earth, 1 kg presses on a scale with 9.8 Newtons of force, 30kg with 294 Newtons, but the scale shows 1kg or 30kg respectively for weight because we tend to think of mass and weight as synonymous.

A very precise spring scale is going to show lower weight at higher altitudes! In orbit, the weight is zero; even though the mass is the same! Because of this variation with altitude, scales that must measure mass accurately do not depend on springs.