Normal thickness gauge, not premium. It has a spinning dial, so the measurement accuracy is not technical, but for personal use. In fact, not at 10 mm, but at 13 mm, so the arrow always does not look at 0. The set included an elastic band to align the arrow at 0, but the height of the elastic was 1.5 mm, so the arrow still looked to the side. In general, it works, good for its money. Please note that there is a logo of the Chinese production company on the dial, which is not shown in the product photo.
I think i have orded 20mm, was on The picture.