Use digital hydrometer to measure sulfation level of battery

Alright, it seems that there is a way to test the sulfation of the battery by using hydrometer to test the specific gravity content of the liquid electrolyte in each cell. I prefer to get a digital hydrometer to log the data because testing each cells need a lot of data logging. Here are some digital hydrometers.

1. SBS-2500 Digital Hydrometer / Density Meter
2. The BeerBug™ - Digital Hydrometer (This one needs to convert into measuring acid)

Here are the steps.