Gravimeter | Data period | Scale factor (μGal/volt) | Noise level (μGal) | Drift rate (μGal/year) | Cryocooler |
TT-70 #016 | 1993.4 - 2003.11 | −58.165 ± 0.061 | ±3 | −15 | APS DE202NF |
CT #043 | 2003.12 - 2009.12 | −59.461 ± 0.079 | ±1 | 239 | Leybold 4.2LAB |
OSG #058 | 2010.01- | −73.8226 ± 0.053 | ±0.2 | <±5 | SHI SDRK 101 |