Check the listing for details. HP - Agilent - Keysight 3581C Selective Voltmeter. Condition: Used. Listed at 1047.00 USD. HP - Agilent - Keysight 3581C Selective VoltmeterItemMake: Agilent/KeysightModel: 3581C Options: Item Specifics/Condition Refurbishment Selective VoltmeterDescription The 3581C is a special version of the 3581 designed specifically for communication work. The 3581C has three selectable input configuration: Unbalanced, Balanced-Bridged and Balanced-Terminated. The 3581C can be calibrated for absolute measurements in dBm/900 ohms, dBm/600 ohms or rms volts. The 3581C is a Selective Level Voltmeter. The 3581C has a 600-ohm balanced output The HP model 3581C wave analyzer is a portable instrument designed specifically for use in the audio(15Hz to 50 kHz)Fequency range. Images Term of sale Included Items: This sale does not include probes, cables, manuals, power cords or any other accessories unless otherwise stated or pictured.