I'm a newbie to this site, but used a calculator that was the predecessor to the calculator mentioned by Rogatory for years.I believe it was called the Contruction Master.The unit he recommends is actually more geared to general use and from the looks of things has smaller increments (1/64). It has a heavier duty case, and it costs less. You might want to buy three of them though. One for home, one for the shop, and one to go with you on jobs. The idea for a quick reference cheater is great too! Indispensible when someone calls and you're trying to give info or you just don't want to keep tapping in numbers. Isn't technology great?! Oh yeah, I believe I saw the calcualators at Home Depot. Ciao for now.