Before glowing screens and silicon chips, engineers used slide rules to design skyscrapers and send people to the Moon. Calculation meant moving a physical object, not tapping an app, and there was a certain clarity in that, a feeling that your hands and brain were in the same loop. Some of that intelligence at the fingertips is worth bringing back in a world that defaults to calculators for everything, even quick conversions.
Titaner’s Tisolver is a 3-in-1 titanium calculating ring ruler that sits at the intersection of tool, instrument, and jewelry. It measures curves and straight lines, converts between metric and imperial, and calculates square area, all in a GR5 titanium body you can wear or clip to your gear. The company calls it a bridge between the physical and mathematical worlds, a way to put slide-rule logic back into something you can roll across a table.
Designer: Titaner
$88 (44% off). Hurry, 40/550 left! Raised over $93,500.
Tisolver uses a high-strength magnetic lock to give a clear tactile and audible click every time the ring completes a full 10cm rotation. The equation is simple: the number of clicks times ten plus the current reading in the HUD window equals the total length. You can roll it along a cable, a curved edge, or a piece of leather, count clicks, glance once, and know the measurement without juggling a straight ruler and a flexible tape.
Side A has a 10cm metric scale and a 4-inch imperial scale laser-etched on the same ring. You snap Tisolver to zero with the magnetic feedback, align the HUD window’s red line with the metric value you care about, and the imperial equivalent sits under the same line. For longer numbers, you borrow a classic slide-rule trick, shifting the decimal, aligning at 4.2 instead of 42, reading the imperial, then shifting back, all without opening a phone.
Side B keeps a 10cm outer scale but replaces the inner ring with a square-area scale. When you roll and then align the red line with a side length, say 5cm, the inner scale shows 25, the area of a square with that side. Designers, leather crafters, and DIY people can measure one edge of a panel and instantly see coverage instead of doing mental multiplication. Flip the ring, and the same alignment also shows the imperial length.
The dual-locking traction system uses a soft rubber O-ring on the outside and hidden reverse anti-slip teeth on the inside that bite into the rubber, so the ring grips greasy workbenches or wet glass without slipping. The quarter-arc PMMA HUD window with a red reference line acts like a tiny scope, improving readability and protecting the finely etched scales. GR5 titanium, with a fine blasted matte finish, keeps the body light, corrosion-resistant, and warm in the hand.
The Titaner Tisolver lives on a lanyard around your neck, on a keychain, or clipped to a backpack, ready whenever a measurement or conversion pops up. When you are stuck on a problem or waiting for a render, the magnetic click becomes a small mechanical meditation, a way to keep your hands busy while your brain turns things over. The ring rolls, clicks, and resets, and that rhythm helps ease tension without needing a screen or app to distract you.
A titanium ring that measures, converts, and calculates without a single pixel in sight feels like a satisfying little rebellion against the reflex of reaching for a phone every time you need a number. For people who like tools that think with them, not just for them, the Titaner Tisolver quietly earns its place on your chest or in your pocket, turning quick math and measurement into something you can touch, hear, and rely on.
$88 (44% off). Hurry, 40/550 left! Raised over $93,500.
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