Like WV said, a cool cup and hydrometer can affect the reading a little bit. So, another way to keep it warm is to hang the hydrometer cup, with the hydrometer inside of it, inside the syrup pan while you are boiling. This keeps it hot and also keeps it near to where you are going to use it again.
shrunken producer, from 8,000 taps to 4,000 vac 250 gravity
5x16 woodchip fired evaporator with 5x10 max flue and 5x6 revolution front pan
CDL 2400 RO
Atlantic Fluidics A-20 vac pump with a Bernard mechanical Double Releaser
sp-11, bb2 vac pumps