The 180 Series line of Professional, hand-held TIMS designed for testing during installation, provisioning and troubleshooting of DSL, ISDN, DDS, leased lines, dial-up and POTS circuits. Provides Noise and Attenuation for Wireless, Carrier and Microwave circuits. Combines the functions of four test instruments into one compact unit and all functions are easily accessed through the front keypad and menu drive for simple operations. The unit features a 20Hz-50Khz synthesized sine wave generator, a full featured transmission test set, an auto ranging DMM (186T), telephone handset with dial, talk and listen capabilities. An RS232C interface allows communications between the 180 and a host computer.