Temperature correcting hydrometer

Your photo is a good reason why some folks hate hydrometers.
temp in Fahrenheit on one side of the tube, green to add and red to subtract numbers in Fahrenheit on the other side of the glass tube. Celsius would be an option.

Francis Freas makes reading easier.

does this help? Is there a decimal point on that example for the sg of battery.
http://all-about-lead-acid-batteries.capnfatz.com/all-about-lead-acid-batteries/lead-acid-battery-maintenance/battery-voltmeter-soc-temperature-correction/

Hes teaching you to fish in a sense.

BFL13 wrote:
Colder electrolyte is more dense, so the bobber floats higher, SG reads as higher.

That's interesting but non responsive to my question.

Colder electrolyte is more dense, so the bobber floats higher, SG reads as higher.