12.A.3.Gravity meters (gravimeters) or gravity gradiometers, designed or modified for airborne or marine use, usable for systems specified in 1.A., as follows, and specially designed components therefor:

a. Gravity meters having all of the following characteristics:
1. A static or operational accuracy equal to or less (better) than 0.7 milligal (mgal); and
2. A 'time to steady-state registration' of two minutes or less;
Technical Note:
In Item 12.A.3.a.2., 'time to steady-state registration' (also referred to as the gravity meter’s response time) is the time over which the disturbing effects of platform-induced acceleration (high frequency noise) are reduced.
b. Gravity gradiometers.