Correct Hydrometer

[Shoozie Q]

Can some one point me to the correct hydrometer.   Like the specific one.  I've looked

till I'm cross-eyed and all I see is ones that don't scale down to hundredths.  Thinking

about tackling a couple vintage lamps that are getting a bit too foggy for my taste and want

all the tools on hand to avoid wounding the poor things.    TIA