If you want consistent results, you could look into purchasing scientific / laboratory notebooks:

http://www.snco.com/pricelist.htm

(Many other sites available, the one above was simply at the top of the search results.)

These notebooks are important in that they are used to back up results in scientific journals, and can even be considered legal documents in some patent cases (e.g., "when was process X by company Y /really/ invented?").

http://www.swarthmore.edu/NatSci/cpurrin1/notebookadvice.htm

http://www.google.com/search?q=LABORATORY+NOTEBOOK

If there's a college or university near where you live, you may want to drop by their book store and see what they offer.