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Hardness Sets

Model: YQ-813
Hardness Sets   The scale in increasing order of resistance to abrasion is:5-9 1.     APATITE 2.     ORTHOCLASE 3.     QUARTZ 4.     TOPAZ 5.     CORUNDUM..
$60.00
Ex Tax:$60.00
Model: YQ-810-1
Hardness Sets   The scale in increasing order of resistance to abrasion is:1-10 1.     TALC 2.     GYPSUM 3.     CALCITE 4.     FLUORITE 5.     APATI..
$235.00
Ex Tax:$235.00
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