Very high quality; absolutely as accurate as anything I need for woodworking; But what I like best are the markings on this square - they're ALL in English units, so I don't have empty space filled with centimeter scales on either side of the ruler. I don't mind the metric system, but when working with inches and fractions of an inch I'd like to be able to set the square on either side and easily see that it's set to the inch value I want. It's a bit pricey; and compared to Swanson's square, which is about as accurate but has a ruler with centimeters and inches on each side; it's also about 1/4 the cost; but the difference in size and weight is easy to see and feel