Center Point Finder

This model is a completely new, innovative Center point finder. (But then I found out that there was a similar commercial product after I posted this.) Conventionally, to find the center point of a circular cross-section, a centerline finder was used to mark at least two centerlines, and then the intersection of those lines was used to determine the center point.However, this method can incur errors depending on the type of tool or marker (writing instrument) used. This device accurately locates the center point of a circular cross-section with a single use (measuring range: 15 mm to 130 mm in diameter). Another thing is that this device can instantly find the center point of any cross-section that is symmetrical about both the x-axis and y-axis, such as a circle, a square, or a hexagon. It can also be used to find the center of a side of a piece of lumber with both edges parallel. After I made this and showed it to people, someone told me there was a similar product, so I looked it up