Flange Wizard 53087-D Large Digital Magnetic Centering Head

For pipes 12” and larger is designed to be hands free so you can establish and mark a center-line at any angle around the circumference (inside and out) on a pipe or tank.

• Accuracy:  +/- 0.2 of a degree
• Battery:  AAA X 2 (included)
• Comes in a compact case

https://youtu.be/7VSq7oPiCoA