Ballantine Laboratories MODEL 420 AC & DC Precision Calibrator

Vintage Ballantine Laboratories A.C. Volts Decibel Model 643 Voltmeter/Tested

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Kin-Tek Laboratories Precision Calibration System

Vintage Julie Research Laboratories (JRL) Standard Cell Oven, model SCO-106,

ASL Automatic Systems Laboratories F26 Precision Thermometry Bridge

JRL TRS-104 AC/DC Thermal Transfer Standard Julie Research Laboratories GPIB