please ansower

[ma330]

hi to all'
I have some questions about lrl.s
1 - you must have contact with hands or bars must be insulated?
2-connect the oscillator to find the metal rod can be effective?
3- Do not use as a probe, two probes have power?
4 - How to find the generator helps metals?
5 - What is the best waveform generator to build?
6-Is the frequency of different metals?
7-What is the best power for the generator?
8-Crossing frequency of the transformer in the output waveform does not change?
9-And is located in the following four white capsules. What does it do them?