The tinySA® wiki provides information about the tinySA Ultra, also known as the tinySA4. These small spectrum analyzers and signal generators have some impressive features. The tinySA Basic includes a 2.8-inch screen, two inputs for frequency ranges, and switchable resolution bandpass filters. The tinySA Ultra offers a 4-inch screen, a wider frequency range up to 6GHz, a built-in 20dB optional LNA, and a microSD card slot for storing measurements. It can be connected to a PC for control. However, there are limitations due to its low cost and small size. The wiki includes videos and a manual for more information.
https://www.tinysa.org/wiki/