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These part numbers have the same form, fit, and function of 600a
600A spec. code meanings
Equal or unequal distances between graduations representing values of measurement on a scale.
Mfr. Cage 18479
Fluxmeter, also referenced with federal logistics item name code 20901 - An electrical instrument which measures magnetic flux. with appropriate calibration it can be used for measurement of the intensity of a magnetic field. see also meter, field strength.