Granite (marble) square ruler

Granite square ruler is mainly used for measuring the flatness, verticality, and straightness of workpieces. Our company produces granite square rulers, marble square rulers, and rock square rulers with good rigidity, high hardness, and strong wear resistance. The square rulers are not afraid of corrosion, rust, or dust, and are easy to maintain and have a long service life.

Granite square rulerMainly used for measuring the flatness, perpendicularity, and straightness of workpieces. The main mineral components of granite angle rulers are escape stones, plagioclase, a small amount of olivine, biotite, and trace amounts of magnetite. They have a black color and precise structure. After billions of years of aging, their texture is uniform, stable, strong, and hard, and they can maintain high precision under heavy loads.
Our company producesGranite square rulerGood rigidity, high hardness, strong wear resistance, the square ruler is not afraid of corrosion, rust, or dust, easy to maintain and upkeep, and has a long service life.

Granite square ruler specification (mm)	Measure the perpendicularity of the surface to the base plane （um）		Measure the flatness or straightness of the surface （um）		Flatness or straightness of the base surface （um）
	accuracy class
	00	0	00	0	00	0
100×63	2	4	1	1	1	1
160×100	2	4	1	2	1	1
250×160	2.5	5	1	2	1	2
400×250	3.5	7	1	2.5	1	2
630×400	4.5	9	1.5	3	1	2.5