Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE products ( product_name VARCHAR, product_category_code VARCHAR, color_code VARCHAR )
TABLE: CREATE TABLE ref_colors ( color_code VARCHAR, color_description VARCHAR )
TABLE: CREATE TABLE ref_product_categories ( product_category_code VARCHAR, unit_of_measure VARCHAR )

### Question ###
Find the product names that are colored 'white' but do not have unit of measurement 'Handful'.

### Accurate SQL ###

SELECT t1.product_name FROM products AS t1 JOIN ref_product_categories AS t2 ON t1.product_category_code = t2.product_category_code JOIN ref_colors AS t3 ON t1.color_code = t3.color_code WHERE t3.color_description = "white" AND t2.unit_of_measure <> "Handful"