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The resistors just drop the voltage into the scope or freq. counter etc. I didn't use any resistors as I usually use a 10:1 probe on my 'scope and terminate the input to the counter with a 50 ohm load if necessary. If you use a 1:1 probe or run high power then go ahead and install the resistor.The value is not critical at all. I just have 100 watts so I didn't bother.