A gravimeter is not an accelerometer. A gravimeter is used to measure the force of gravity at a place on the surface of the Earth. They may include accelerometers but they aren't accelerometers. Don't try changing the rules of the game in the middle.
ROFL .... ready
Look at the relative version of gravimeter its described thus
Most common relative gravimeters are spring-based. They are used in gravity surveys over large areas for establishing the figure of the geoid over those areas. A spring-based relative gravimeter is basically a weight on a spring, and by measuring the amount by which the weight stretches the spring, local gravity can be measured.
Now lets see how Bill G described his accelerometer
Typically an accelerometer uses 2 major components, a 'fixed' body and a sprung mass. The acceleration is calculated as the difference in location between the body and the sprung mass.
A GRAVIMETER IS A SINGLE AXIS ACCELEROMETER
A gravimeter is a type of accelerometer, specialized for measuring the constant downward acceleration of gravity, which varies by about 0.5% over the surface of the Earth. Though the essential principle of design is the same as in other accelerometers, gravimeters are typically designed to be much more sensitive in order to measure very tiny fractional changes within the Earth's gravity of 1 g, caused by nearby geologic structures or the shape of the Earth and by temporal tidal variations.
