Depth Gauge. This is a new depth gauge. Great for measuring depth. Measures up to 6" and 150 mm. The first 50 mm is in 1/2 mm increments. It measures approximately 7 1/2" (190.5 mm) long. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.