What are the key differences between the SiteHawk SK-4500, SK-6000, and SK-9000 models?

The main difference between the SiteHawk models is their frequency range. The SK-4500 operates from 1 MHz to 4.5 GHz, the SK-6000 from 1 MHz to 6 GHz, and the SK-9000 from 1 MHz to 9 GHz. The only other differences are the accessories included in different kit options. All three models are capable of performing similar types of measurements, and offer similar features, such as the ability to store and recall measurements, edit cable lists, and save screenshots.