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ASTM E19-46 Grain Sizing Disc - Root 2
Eyepiece Reticle to ASTM E19-46 Root2. Circular pattern with 10 different segments each with a progressively smaller pattern for grain size analysis.
G46
£149.63 - £178.11
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Soda Lime 1.5mm thick
+0/-0.1mm
Correct reading through glass