Granite Square Ruler
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Granite Square Ruler nrog 4 qhov chaw precision
Granite Square Rulers yog tsim tawm hauv qhov tseeb siab raws li cov qauv hauv qab no, nrog rau kev ntxiv cov qib siab dua kom txaus siab rau txhua tus neeg siv xav tau tshwj xeeb, ob qho tib si hauv kev cob qhia lossis hauv chav metrological.