For recording research data, experimental procedures, and design ideas, use these notebooks to keep your information safe and well organized. Numbered, acid-free, pages include spaces for title, project number, book number, date, and witness signature. Lined notebooks feature collegeruled pages for easy report writing. Covers for all versions are waterproof and chemical-resistant. All notebooks contain periodic and conversion tables in the back. Admissible as court evidence when used as prescribed by law. Measures 8-1⁄2 x 11" or 218 x 281 mm.