The expedition used a gravimeter, or gravity meter, designed by Meinesz. A perfected gravimeter, hanging in a 'swing', was designed. The gravitational field intensity is measured using the gravimeter. A gravimeter measures this gravitational force. Gravimeter - Operation IceBridge also uses a gravity-measuring instrument known as a gravimeter. An instrument used to measure gravity is known as a gravimeter. Through a supraconductive gravimeter, the observatory provides relative and continuous gravity field measurements. Vening Meinesz then designed a new gravimeter, which the KNMI (Royal Dutch Meteorological Institute) built. The crew collected of lunar samples and took another nine gravimeter measurements. This is counteracted in the gravimeter by integral vibration isolation and signal processing. He was coinventor of the modern gravimeter, invented the zero-length spring, and vehicle-mounted gravimeters. APOLLO will measure all these, plus measure local gravity very precisely, using a precision gravimeter. A gravimeter is an instrument used to measure gravitational acceleration. The modern gravimeter was developed by Lucien LaCoste and Arnold Romberg in 1936. Instead, "g" is measured in the same laboratory using a highly accurate and precise gravimeter.