Tuck this handy writing instrument in your purse or pocket, and you'll never be without a 4" ruler (with three different scale rulers for serious architects), a spirit level, a touchscreen stylus (for typing on your phone or tablet), and flathead and Philips screwdrivers…oh yes, and a twist-open ballpoint pen! For even more convenience, pick up the 3½"-long Keychain version, which includes a 4-cm ruler, stylus, and screwdrivers along with the retractable pen. Made of durable metals, these multitasking pens make great little gifts for handymen and -women and hardworking scribes!