Good tiny device for storing/summing up a few lists of numbers throughout the day?

[Jim Horn]

While the data you want to track isn't financial, any money tracking program would included categories, easy entry, summation, and probably a way to export the data to your PC for record keeping. Currency conversion can be used to convert fluid ounces to milliliters as well. The Palms came with such a program and better ones are available free on the Web. Would that do the job?