A network apparatus is capable of calculating positions on a display screen where connecting states of network apparatuses connected to a network are displayed on the basis of connecting information of the network apparatuses on the network and peripherals connected thereto and displaying the positions. The coil assembly has a coil base and a coil located in a cavity in the coil base. In addition, a test circuit may be coupled between the signal generator and the plurality of output electrodes. In some instances, more than two sets of criteria may be used to identify additional potential chunks to be used should subsets having fingerprint values satisfying either of the first two sets of criteria not be found. The inlet fill tube has a first vacuum tight seal and the outlet fill tube has a second vacuum tight seal. Both the main body and the test indicator are electrically connected to a main board of an electronic device through the interface.