Task: Text to Code
Input (English): SQL: SELECT T1.characteristic_name FROM Characteristics AS T1 JOIN Products AS T2 JOIN Product_Characteristics AS T3 ON T1.characteristic_id = T3.characteristic_id AND T3.product_id = T2.product_id WHERE T2.product_name = "Herbs"
Feedback: Replace product characteristics , characteristic name and product name with reference product categories , unit of measure and product category code . Remove "in characteristics table and".
Output (English): SELECT unit_of_measure FROM ref_product_categories WHERE product_category_code  =  "Herbs"