Can anyone tell me whether the mold spectrum sweep can be used safely in contact mode?

It's safe, but Spectrum sweeps are not effective in Contact Mode. These sweeps generate multiple simultaneous frequencies. Each one requires voltage from the gennie - which has only 20 volts available. If 10 frequencies are generated, that means each frequency gets just two volts, not enough to overcome skin resistance.
Remote Mode works fine because two volts is enough to penetrate a nail clipping.

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