The Markrite Field Book 107 is a high-quality Height of Collimation Level Book that is perfect for surveyors and engineers. With 80 leaves, this book provides ample space to record important data and measurements. The durable cover and sturdy binding ensure that the book will withstand even the toughest field conditions. The collomation format allows for accurate and efficient note-taking, making this book an essential tool for any surveyor or engineer. Whether you're working on a construction site or mapping out a new project, the Markrite Field Book 107 is the perfect companion for your work.