normally you can detect the harmonics by looking the signal strenght, the first blade normally give the gretaer signal (firt on the left of the display) and when you see a line on the display (on the right) with a strong signal is the fisrt harmonic of the 1st blade, so you just have to count the number of line on the left of the display to get the number of blades of the screw.
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Modern Naval Warfare Community Manager
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