Thought my old voltage tester was fine until a weird reading in a 1950s house

I was checking a kitchen outlet in a house from the 50s and my old non-contact tester kept blinking, but my buddy's multimeter showed a solid 120v. Turns out the old knob and tube wiring was giving off a weird field that tricked my tool. Anyone run into this with older systems and have a good tester they trust for them?

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