Have you seen this Kickstarter project? This is a multi-functional tool made from black anodized aluminum that includes a pen, a ruler and an optional strap or touch stylus. The whole object is a teardrop wedge shape that can be used as a bookmark. The pen closes with a magnet and can accept any refill comparable to the Mitsubishi UNI like Pilot, Lamy, Uni-ball, Signo, Pentel, EnerGel and more. Backing options to receive a HMM Rule One start at $45. There’s only two weeks left to back this project and they have not reached their goal yet.
UPDATE: I tried to embed the video here but it didn’t work so I’ve added a photo instead. Sorry!)