Datron, Fluke, Wavetek 4950 Multifunction Transfer Standard

The Wavetek-Datron model 4950 multifunction transfer standard was
designed as a device for calibrating multifunction calibrators,
by acting as a transfer between traditional laboratory references and
the target calibrator located remotely.
It has also found application as an audit standard for
interlaboratory comparisons and proficiency testing.
The 4950 is capable of measuring DC and
AC voltage, DC and AC current, resistance and
frequency over a wide range of values.