Halcyon 701A

The 701A Transmission Test Set measures transmission level, frequency and noise (including notch noise) on voice- grade, and program circuits up to 20kHz in bandwidth. Has dual digital display, crystal-controlled 1004Hz holding tone and can be manually adjusted to provide tones over a 50Hz to 20kHz frequency range. Rechargeable batteries provide the 701A with six hours of normal operating time