I have a wide cut because it takes longer to cool. The long hydrometer is better than the short.
For a cup, I use a Murphy cup that tells what the reading should be at whatever temp. the sample is at.
As back-up, I also have a cup I made out of PVC pipe and a flat bottom cap attached. I always use that with my sap hydrometers.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.