There are plenty of high quality pens on the market. There are also plenty of high quality rulers on the market. Hell, there are even quite a few good pen and ruler combinations on the market, a few of which were also launched on Kickstarter. Thanks to its unique shape and interchangeable heads (lanyard and stylus options are also available), the HMM Rule/One is different enough from the rest of the options to make it worth backing. Each of the teardrop shaped pen/rulers is going to be made out of only five pieces of milled aluminum and anodized in black. The shape is what’s really most intriguing to us because it makes it easier to store in books or notebooks and also makes the marking side of the ruler (inches and centimeters) much easier to see and use. Because it’s made of aluminum, it’s going to be lighter than the other options on the market, which means it’s not too heavy to actually carry around.