Principal limitations of metrical measurements in real radial gravity fields

Since there are no real inertial systems in reality, when a weak gravity field appears, because onlyradial gravity fields exist and no homogenous fields, there only a quasi inertial system (QUIS) canbe constructed in these fields. Real inertial systems are only constructable in fieldfree spaces, farfrom every material body and neglecting classical and quantum gravity structures. If gravity fieldsappear, even weak ones like in example of Earth field, only QUIS are constructable. This QUISallows only a limited description of physical measurements because it deals with radial field lines ofgravity, which are supposed to have a range of Planck-length at the center of Earth resp, thematerial body. Then the smallest QUIS, which can be constructed on the surface of planet Earth hasa range of ca. 10 − 15 m. Smaller metrical length statements on the surface of Earth are senseless. Ifthe measurements have to be finer, one must go afar from surface of the planet, where the radialfield lines have greater distance and in this case greater QUIS can be defined. Then physicalbehaviour of interactions then can be described without contradictions in smaller ranges.