The Earth's gravitational field varies mainly as a function of location (latitude, altitude and local mass distribution) and time (lunar-solar attraction).

The gravimeter developed at INRIM realises the absolute measurement of local gravity acceleration through the free-fall motion of a grave. The method used is recognised as the primary method by the International Committee on Weights and Measures.

The instrument is transportable and is capable of on-site measurements with a maximum extended relative uncertainty of 1,5x10^-8.

Local gravity measurements are used in metrological and geophysical research.

The absolute measurements performed by INRIM are the only ones in Italy (and among the few in the world) that can guarantee the gravity acceleration measurements' traceability.