Magento 2 Size Chart - Cynoinfotech
https://www.cynoinfotech.com/product/magento-2-size-chart-extension/
The Magento 2 Size Chart or Size Guide module lets you create visually appealing size charts popup and help your customers choose the perfect size products. The Size Chart Magento 2 extension helps store admins display size charts to customers to make their sizing decisions easier. Admin can set image, static block, text, table or whatever size he wants to display the chart. Store merchants can also set global, category-specific or product-specific sizes according to business needs.