The Twaddle scale is a simplified scale based on specific gravity where 0° Twaddle equates to SG60/60°F of 1.00 (that of water) and each degree Twaddle equals 0.005°SG. With single degree divisions and are adjusted for use at 15.6°C (60°F) for medium surface tension liquids.
Used for measuring liquids that are heavier than water
Used for those industries that have not adopted density or specific gravity as the standard unit of measurement