It's Parker, not Barker.
How do you know if you've only ever used Doug Jones' Cap Wizard? The Parker instrument ignores other circuitry to the same extent because it also puts out only a very low test voltage. BTW, I'm not putting down the Cap Wizard in the slightest. It has a justified excellent reputation and is a fine instrument in its own right. The Parker website even has links to the Cap Wizard website, suggesting that people buy it if they prefer an analog meter to a digital readout. I just get hot under the collar when people make negative assumptions and claims about something they've never seen.
There you go again.
What calculations are you referring to?
OK, the Parker one doesn't beep and doesn't have an analog display which is easier to instantly interpret. But digital displays won't be damaged by the instrument being dropped, so it's not all bad.