Photo 1 of K KORKUAN Smart Ring Size Measuring Tool?Universal Compatibility for Ring Measurer, Compatible with Oura Ring Gen3/Oura Ring 4 Sizing Kit, Size 5-13

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Photo 1 of K KORKUAN Smart Ring Size Measuring Tool?Universal Compatibility for Ring Measurer, Compatible with Oura Ring Gen3/Oura Ring 4 Sizing Kit, Size 5-13Photo 2 of K KORKUAN Smart Ring Size Measuring Tool?Universal Compatibility for Ring Measurer, Compatible with Oura Ring Gen3/Oura Ring 4 Sizing Kit, Size 5-13