Tempo Communications Tempo Communications;TM-500iTest telephone DSL-compatible test telephone

Ergonomically shaped test telephone for the installation and maintenance of voice service on analog lines. The device works without batteries (supply via the telephone line) with a high-impedance monitor data and DSL-safe. Polarity test, speed dial and pulse dialling belong to the scope of services. The supplied headphone is hands-free. The TM-500 offers security by overvoltage and overcurrent display. This text is machine translated.