This popular instrument was designed for, and meets the North American Bell Standards. The 3551A is optimally suited for voice, program, and data circuits up to 50 kbps. Measures 2 & 4 wire balanced circuits and includes balanced impedances of 135, 600 and 900 ohms. Ideal for measuring attenuation distortion, message circuit noise, loss, noise-with-tone, noise-to-ground, and single frequency interference.
AC Power: 100V/120V/220V/240V 48 Hz-440Hz, 4 VA.
We do not have the battery packs.

$350.00 US - Tested guaranteed working unit - Batteries have been removed.

$195.00 US - Used, repairable condition - Batteries have been removed.