Note
Service magazine, Jul 1936, p. 321.
Sensitivity (vert & horiz): 0.2 volts per inch
Sweep: 15–25,000 Hz
From the ad:
Segregation of controls into individual panels simplifies operation Single or double trace alignment. All controls, including the beam, centering on the main panel. Calibrated screen supplied with each Oscillograph.
High sensitivity horizontal and vertical amplifier. 0.2 volts per inch. Wide range sweep circuit Oscillator, 15 to 25,000 Hz.
See also RFO-4.