add_filter( 'woocommerce_get_price_html', 'custom_price_html', 100, 2 );
function custom_price_html( $price, $product ){$meta_values = get_post_meta( get_the_ID(), 'unit',true );$price = $price .'/'. $meta_values;return apply_filters( 'woocommerce_get_price', $price )}