Premium GR5 Titanium Construction：ultra durable anti‑rust and scratch resistant；laser engraved scales for long‑lasting clear reading；eco‑friendly and stable for daily heavy use 2‑IN‑1 Measuring And Calculating：supports addition subtraction multiplication division via log scale；measures straight and curved surfaces accurately；metric cm version 10cm range for versatile use Ultra‑Light Portable Edc Design：only 12.3g–20.7g lightweight；compact round shape easy to carry；can be worn as pendant or keychain accessory；ideal for daily carry and on‑the‑go use Fidget Stress Relief Function：smooth dual‑ring rotation with satisfying tactile feedback；helps relieve anxiety and improve focus；suitable for office work study and break time relaxation Multi‑Scene Versatility：perfect for engineers designers artists students craftsmen and outdoor enthusiasts；three versions available metric titanium metric copper‑titanium imperial to meet different needs TITANER Multi-Variant Slide Rule Set: Precision Measurement & Calculation Tools for Professionals Uniting aerospace-grade titanium craftsmanship with mathematical ingenuity, the TITANER Slide Rule series redefines portable measurement tools. This multi-variant set offers engineers, architects, and EDC enthusiasts four specialized configurations: Full Titanium Metric (10cm) - Ultra-lightweight precision for technical drafting Full Titanium Imperial (5inch) - ASTM-compliant design for North American standards Copper Core Metric (10cm) - Retro aesthetics with reduced rotational friction Copper Core Imperial (5inch) - Heavy-duty build for workshop environments Core Innovations : Laser-Engraved Logarithmic Scales: 0.01mm precision across dual measurement systems (metric/imperial) Modular Material Design: Grade 5 titanium outer ring + optional phosphor bronze inner core Tactile Feedback Mechanism: Ceramic bearings deliver click-per-rotation confirmation (1 click = 10cm/5inch) Dual-Function Geometry: Ø31.8mm (metric) / Ø40.44mm (imperial) optimized for finger grip Professional Applications: Engineering: CAD blueprint verification (±0.5% tolerance) Architecture: Curved surface measurement (e.g., Nakagin-style modular designs) EDC Optimization: Doubles as fidget toy & necklace pendant