For example: Agilent E4440A or Anritsu 68369
Psophometer

Model:3556A

Manufactured by: Keysight / Agilent

Category:Meters

Keysight / Agilent 3556A - Meters

Keysight / Agilent 3556A Overview

Designed for European operation; Voice frequency level measurements:
Range: -80 dBm to +30 dBm full scale;
Level accuracy: ±2%;
Temperature range: 0°F to 120°F;
Input impedance: terminated, 600 or 900 Tone, balanced;
bridging, 100 kTone balanced

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