Well, this is how I tell you, stabilizing you will not measure it with a tester, what a stabilizer does is prevent peaks, that is, that there are no ups and downs and that you could see it with an oscilloscope, not with a tester, if you you reduce the input voltage, reduce the output voltage, but it destabilizes, that output voltage is stabilized if the device works well, I hope you have clarified your doubt, greetings.