The Apollo Technical Pen and Drafting Scale
The Apollo Technical Pen and Drafting Scale are machined out of aerospace-grade titanium and marine-grade stainless steel, the Apollo Pen...
https://www.spicytec.com/2013/11/the-apollo-technical-pen-and-drafting.html
The Apollo Technical Pen and Drafting Scale are machined out of aerospace-grade titanium and marine-grade stainless steel, the Apollo Pen is designed to support over 50+ precision-point refills and multiple upgrade modules. Pen also forged from a single solid block of aircraft grade aluminum, the Apollo Tri-Scale serves as a fully functional architect's scale and a transporter case for your Apollo Pens. The Tri-Scale combines 6 precision scales with a 3-pen storage and selection system in a gorgeous, minimalist form-factor with a modern twist. You can own one here.