Duksbak WL-7 Coil Bound Field Book – Level Pattern (4.5" x 7") The Duksbak WL-7 coil bound field book features a level pattern layout, ideal for elevation notes, leveling tasks, and precise field measurements. Built with waterproof pages and a durable cover, it ensures dependable performance in harsh site conditions. Key Features • Level pattern pages for elevation and measurement recording • Waterproof, tear-resistant sheets for field durability • 4.5" x 7" compact and portable design • Coil binding for flat, easy writing