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@aidan
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. These hydrometers are available in 2 lengths each with single degree subdivisions and are adjusted for use at 15.6°C (60°F) for medium surface tension liquids.
yeah...like i said...twaddle!