basically the diesel range SG
also these need to be used in a controlled environment at the set temp for the hydrometer say 15/16c else will be inaccurate.
when I was doing miss fuel (petrol/diesel) mixes I couldn't get 1 hydrometer with both scales on meaning the scale range wouldn't fit into a hydrometer, so had to adapt the diesel one setting my own marks for controlled amounts in test samples, I did contact a company who would of made a one off hydrometer for me but to a very expensive cost.
I still have my hydrometer if you want a sample testing in anyways (diesel range)