The Mini Titanium Curve Measure Logarithmic Ruler from Titaner is a versatile device that combines functionality, aesthetics and fun. It is made of titanium and copper allowing for continuous measurement over a variety of surfaces. The circular design eliminates the limitations of traditional rulers. With a circumference of 10 cm, the Mini Titanium Curve Measure provides accurate measurements. You simply roll the ruler over the surface, recording the number of revolutions and the final position of the inner ring relative to the outer scale. This allows you to measure even complex shapes quickly and conveniently. The ruler also includes addition and multiplication functions based on logarithmic principles. In addition, it can serve as a fidget toy. Smooth rotation and light clicks provide a pleasant tactile experience, helping to relieve stress while working or studying. The manufacturer offers the Mini Titanium Curve Measure in different configurations and sizes. The cost of the device on Kickstarter is $53.98