Review on Precision Measuring with Woodworking Caliber Marking Degrees by Greg Lockhart

The magnetic ruler holder is convenient, it allows for easy conversion from US to metric and the powerful magnet holds the ruler securely. Once installed, the hand-tight handle grips the ruler securely. It also makes storage easy and convenient. I found it very accurate, it made my measurements more accurate and much quicker to read when working with tubes, pipes and rods.