The Markrite Field Book 100 - Rise and Fall Level Book is a must-have for any surveyor or engineer working in the field. This durable field book features a tough cover and waterproof paper, making it perfect for use in all weather conditions. The rise and fall feature allows for accurate elevation calculations, while the 80 leaves (160 pages) provide plenty of space for notes and sketches. With its convenient size and sturdy construction, the Markrite Field Book 100 is an essential tool for anyone working in land surveying, construction, or engineering. Stay organized and prepared on the job with this reliable and professional field book.