Each of the three displays has an additional number compared to most portable magnetometers. Each of the 4 ½ figures is displayed in two ranges: + \/ -1999.9 and + \/ -199.99 milligauss. Updates are three per second. Since earth areas are typically around 500 milligauss, the nine vertical pitch control (three of which are X, Y, and Z) allows you to add or subtract 600 milligauss with.01 milligauss accuracy. So, Earth's field can be subtracted when required. If reading in the more sensitive 199.99 range, this domain neutrality feature is often necessary because the domain is usually stronger than 200 milligauss.