With respect to the signal generator in the second video, it looks like it has the exact same screen and buttons as my 60MHz Koolertron signal generator, except in a much different case. When I bought mine (Koolertron), I was disappointed because the output voltage reading on the screen is peak to peak, not RMS, and is only accurately representing the voltage when completely unloaded. Connecting a 50ohm load cut the unloaded voltage in half, which suggests the output impedance is actually 50ohm, but the output voltage claims were as far to the dishonest side as possible without falsely advertising. Mine runs about 1.78v RMS into a 50ohm load (3.53v RMS with no load ie. 10v pk-pk). When I looked at the output voltage on my Picoscope 3206D (235MHz bandwidth) the voltage remained fairly steady until about 54MHz. Aside for the shady voltage claims and frequency stability being a bit drifty, I was happy with my $60 investment! But be ready for that type of issue if you go looking at the voltages because, at first, I thought I had got a broken unit, turned out to just be dishonest advertising.