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Used to line the bottom of a sluice box to trap gold nuggets
then adjusts operating frequencies to reduce signal noise
Handcrafted in the U
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Operating Frequency ~20kHz
Jeweler's 30x21MM Chrome Round Body Triplet Loupe With Leather Case hiking Used to line the bottom30 x 21 mm Triplet Jeweler's Loupe SKU: MJ3921C 30X Product Details: Powerful three element 30 power x 21 mm jewelers loupe in a polished metal housing with a leather case. Triplet Lens Design: A triplet lens is an optical device consisting of three single lenses. The triplet design is the simplest to give the required number of degrees of freedom to allow the lens designer to overcome all Seidel aberrations. Aberration leads to blurring of the image
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