I have used two (because the first eventually failed) of the cheap generic Chinese scales. When I bought a Riverstone scale there was an issue that might catch others out, as it did for me for a couple of minutes. I set it up, calibrated it, and then recalibrated with the 'record level arm' attached. It worked perfectly, showing 5g with the calibrating weight on the target pad. My cheapo Chinese scale also showed 5g with the weight on.
The issue came when trying to check the actual VTF of my cartridges. When the cheap Chinese said 2g, the Riverstone said 0.5g. Eventually I figured out that the cheap Chinese scale was a lot higher above the turntable platter, and I was measuring the VTF with the tonearm still raised somewhat, and still being held up slightly by the arm lift. Once I put the Riverstone scale under the stylus, the reading of 0.5g went to 2g as soon as I lowered the tonearm lever. A simple issue, but one that might catch out the unwary, as it did me for a couple of minutes.
Perhaps the main message I should pass on is that both scales agree once the tonearm is completely lowered. Very likely the mechanism inside is exactly the same.