NOVELTY - The device has two measuring tubes (4) provided with inner sides and outer sides, where the device is made of iron, aluminum, magnesium or titanium. The inner sides of the tubes comprise pressing elements with two key touch areas (5). The tubes are symmetrically spaced from a midpoint (3') of an axle (3), where length of the tubes is greater than or equal to 50 mm or lesser than or equal to 1200 mm. The key touch areas comprise a rigid portion, a cylindrical elastic portion (5b) and a contact surface (7). Outer surfaces of the key touch areas are in contact with a silicon ingot (2).    USE - Centering and/or marking device for determining and/or marking a symmetry center of a cuboid material block e.g. moncrystalline silicon ingot and multi-crystalline silicon ingot, in a sawing fixture of a cutting machine for manufacturing bricks that are sawed to manufacture wafers e.g. solar cells, semiconductor wafers and quartz wafers (all claimed).    ADVANTAGE - The measuring tubes are symmetrically spaced from the midpoint of the axle, so that centering and/or marking of a vertical Line of symmetry at outer surfaces of the ingot is enabled, thus enabling central, symmetrical or parallel positioning of the ingot with respect to a co-ordinate system, a wire frame and/or a saw band of a cutting machine, and hence improving centering efficiency of the ingot. The touch areas comprise fillers, so that the touch areas exhibit small electric conductivity, low heat guiding co-efficient and high homogeneity. The device is made of iron, aluminum, magnesium or titanium, thus reducing weight of the device while enabling better handling of the device.    DETAILED DESCRIPTION - The key touch areas are formed as flat surfaces, rollers or wheels. An INDEPENDENT CLAIM is also included for a method for manufacturing wafers and bricks.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic perspective view of a centering and/or marking device.'(Drawing includes non-English language text)'    Silicon ingot (2)    Axle (3)    Midpoint of axle (3')    Measuring tubes (4)    Key touch areas (5)    Cylindrical elastic portion (5b)    Contact surface of key touch areas (7)