Lab Notebook for Researchers Sequential Numbered Pages 5 x 5 Quad Ruled Grid This laboratory/research notebook is meant to be a high-quality and more affordable alternative to other lab books in the market. It is made for independent researchers or graduate students (such as PhD or engineering students) to record research progress and thoughts. Principal Investigators on a budget could consider purchasing this notebook for the rotating and permanent graduate students in their research labs. It is also great for researchers working in corporate labs.