Wordpress - How to show product SKU on product page

Add this to your functions.php

add_action( 'woocommerce_single_product_summary', 'dev_designs_show_sku', 5 );
function dev_designs_show_sku(){
    global $product;
    echo 'SKU: ' . $product->get_sku();
}

This will output the product SKU below the product title. See image below. The product SKU is VERTEX-SLVR.