3 min read The latest version of our best-tested smart ring is now up for pre-order and sizing kits are available now. The Oura Ring 5 is the smallest iteration to date and 40% lighter than its predecessor. Oura’s latest fitness tracker will ship out pre-orders on June 4. OURA JUST ANNOUNCED the launch of its biggest (but in a literal sense, smallest) innovation to date: the Oura Ring 5 . The brand promises the latest in its expansive line of high-powered smart rings will be its most compact version yet, and 40 percent smaller than the Oura Ring 4 . Pre-orders are now open on its site with first shipments going out on June 4. We’ve tested every Oura Ring since the first release, and one of the critical steps we recommend before purchasing a ring is getting one of Oura’s sizing kits . This kit is only $10, and the amount is applied toward the cost of the ring, but it assures that you get right the best fit for your finger.…