Final answer:
The dial accuracy of the HP Model 204C Oscillator is ± 3% of the set frequency.
Step-by-step explanation:
The dial accuracy of the Hewlett Packard (HP) Model 204C Oscillator is ± 3% of the frequency setting. This specification means that when a frequency is set on the oscillator, the actual frequency output can vary by up to 3% above or below the chosen setting. This is an important parameter for precision in applications requiring a stable and accurate frequency output.