AT-3 Audio Tester Ultra, Split-Design 5-in-1 Signal Generator, Long-Distance …
AT‑3 Audio Tester Ultra is a professional troubleshooting tool designed for live sound, church audio teams, AV techs, rentals, and studios. What makes AT‑3 different from AT‑2?. AT‑2 is a compact all‑in‑one tester.