125 135 for sale, brand-new and used.

Altek 334A Process Loop Calibrator New - Factory Authorized Distributor - Factory Warranty All 4 to 20 mA Loop Functions Source 0.00 to 24.00 mA or -25.0 to 125.0% read mA or percent to 52.00 mA, simulate 2-wire transmitters, measure -99.99 to 99.99 volts DC pow

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Here is an HP 3551A Transmission Test Set... 40hz to 60Khz - Hewlett Packard, w/probes, accessories and ac plug. It does not want to power up.

The HP 3551A Transmission Test Set is a rugged, portable test Set that provides the basic Analogue tests to isolate faults and to qualify circuits for voice, Data, and broadcast service. Unit Condition & Testing: This "previously owned / used" equipment is in very good CONDITION visually and by reported test procedures. Further visual and limited functional panel display test show all “Display and Audio Monitoring of Frequency Generation OK".

I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806

ADN-500N.M 500 DYNAMIC METER N.M TESTER DIGITAL TORQUE

ADN-500N.M METER DIGITAL TESTER 500 N.M DYNAMIC TORQUE

5000 METER TESTER ADN-5000N.M DYNAMIC DIGITAL N.M TORQUE

DIGITAL DYNAMIC N.M 5000 ADN-5000N.M METER TESTER TORQUE

DIGITAL DYNAMIC TORQUE TESTER METER 2000 N.M ADN-2000N.M

DIGITAL DYNAMIC TORQUE TESTER METER 200 N.M ADN-200N.M

DIGITAL DYNAMIC TORQUE TESTER METER 50 N.M ADN-50N.M

DIGITAL DYNAMIC TORQUE TESTER METER 30 N.M ADN-30N.M

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