The tone generator makes it simple to test continuity, polarity, send tone and even supply talk battery to any configuration of pairs in 8-position modular jacks and plugs. Combines the features of our tone generators and a modular breakout adapter. In-line testing is made simple with both a modular plug and jack on each unit. 8-position snag-proof modular plug. 8-position jack with protective cover. Quick reference guide with common wiring configurations. Selectable solid/warble tone signal. Tone, continuity and talk battery supply using alligator clips. Weather-resistant design. Battery operated (9 v not included).