Specific Gravity Test

The specific gravity of the electrolyte determines the level of the float in the liquid. With the float in a high position the specific gravity is high and when the specific gravity 5 low the float sinks to the lower position.
Using a hydrometer the specific gravity readings are taken when the liquid level crosses the scale on float. This should give a accurate indication of the state charge of the battery.
The volume and the specific gravity of the electrolyte varies with the change in temperature.