KOKUYO LEVEL Book, waterproof, set of 5 with grid ruling. - Brand: KOKUYO - Model Name: LEVEL Book - Feature: Waterproof - Page Type: Grid ruled - Quantity: Set of 4 Thank you for viewing. Hard and durable cover The hard cover is designed for outdoor use, making it easy to write with one hand and providing durability. Compact size Perfect for pockets of work clothes on-site, as well as everyday wear. ● Compact size, ideal for carrying around. The ruled content is suitable for recording surveying data. ● The paper is synthetic paper, and the cover is a water-resistant type with a resin cover.