The Sokkia EL5 40x Removable Eyepiece for B20/AT-B2 Levels (210160155) is specifically designed to increase the magnification of the Sokkia B20 Automatic Level from 32x to 40x. This allows for more precise observations and is especially useful for tasks involving accurate leveling and surveying. Installing the EL5 is simple - just remove the standard eyepiece and attach the EL5.