Ballantine Laboratories MODEL 420 AC & DC Precision Calibrator

Vintage Military Resistance Calibrator CR-100CM Industrial Instruments Ordnance

1000 Ohm 1 kOhm Ω Resistance Standard Resistor Calibrator Accuracy 0.005%

TAYLOR 152S3 MODEL B 24 MA 30 VDC PRECISION CALIBRATOR B47

Boonton 4300 Radio (RF) Powermeter Programmable Calibrator Module NS-V3C

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Transmation 1170 Frequency Calibrator

Bell & Howell Tape System Calibrator TSC 1000 Test Function Generator Tested