For example: Agilent E4440A or Anritsu 68369
155 Null Detector-Microvoltmeter
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Keithley Instruments 155 Overview
Null Detector-Microvoltmeter The 155 Null Detector-Microvoltmeter covers the measurement range 1 ?V to 1000 V. Battery powered. ?2% of full scale. Common Mode Rejection is equivalent to 140 dB. Input resistance 100 Mohms, 3-1 kV range. Manufacturer's Standard Accessories Instruction Manual