Used to establish and test communications on an active analog line, the Model 390 telephone test set features built-in ringer, 10-number programmable memory with battery backup, tone and pulse dialing, last number redial, mute, polarity test, and line disconnect. Its high- impedance monitor helps to prevent disruption of sensitive circuits.
Used to establish and test communications on an active analog line, the Model 390 telephone test set features built-in ringer, 10-number programmable memory with battery backup, tone and pulse dialing, last number redial, mute, polarity test, and line disconnect. Its high- impedance monitor helps to prevent disruption of sensitive circuits.
