They are claiming 60 dB dynamic range over the full frequency range. Below is quote from site.
"Designing a metal shield for the RF front end, allowing the S21 to have a dynamic range better than 60dB over the full frequency range"
They also have a very nice NanoVNA RF demo kit that looks very good. It should be nice for demonstrating various filters. But there was no price given for that, unless its included with unit.
