| Model | Min. Freq. | Max. Freq. | Freq. Resolution [Digits] | Measurements |
| 106 | 30 MHz | 2.8 GHz | 7 | Frequency |
103 | 1 mHz | 3.0 GHz | 10 | Radio measurements, Frequency | 104 | 10 Hz | 3.0 GHz | 10 | Frequency, Period | 1803D | 5 Hz | 200.0 MHz | 7 | Frequency | 1804D | 10 Hz | 1.0 GHz | 7 | Frequency | 1823 | 5 Hz | 175.0 MHz | 8 | Frequency, Period, Ratio, Totalization, Time interval | 1856C | 5 Hz | 2.4 GHz | 8 | Frequency, Period, Totalization, Event | 1875 | 5 Hz | 2.4 GHz | 8 | Frequency |