方便電工辨別電線束中、交叉連接點或遙控端點中的導線。可用
于雙絞線（電信、數據通信等）、單導線、同軸電纜、無電交流
電線以及其他大多數的電線。
樣本編號       UPC號                         說明
77HP          08687                  77HP音頻發生器
77HP/6A     08688                 77HP/6A音頻發生器
77HP/6AC  60480                 77HP/6AC音頻發生器
樣本編號      UPC號                         說明
77CS         08686            經典77系列音頻發生器皮質繩套

特性/規格                                                     77HP        77HP/6A          77HP/6AC
可選鳥鳴聲                                                      √              √                        √
持續測試                                                         √              √                        √
極性測試                                                         √              √                        √
通話電池供電                                                   √              √                        √
雙線模塊測試引線（RJ-11）                              √               √                       √
三色LED指示燈（顯示交流環形連接法線電壓）     √               √                        √
防風雨設計                                                     √               √                        √
帶針床穿透器的扁嘴夾頭                                                    √                         √
織物測試引線                                                                                              √
工作電池（9V，不包括在內）                            √               √                        √