to get good reproducibility and quality work. Using this I can easily duplicate the gap size for small gaps within the 2"/50mm capability of the device. It's made from durable aluminum that's nicely anodized and the scales are stamped into the metal. It should last forever hold and it's good have made a small tool to add to my woodworking toolbox I recommend this TopGearWorld Brand Gap Measurement Ruler Mini Woodworking Depth Gauge Tool Metal Alloy Wood Tenon Rule Carpenter Line Template Tool Small but efficient and well made I hope you found the information and my review helpful.