Sequence of work
"15,000 km Annually"
1. Take measurements no earlier than 6 hours after the previous recharging.
2. Unscrew or remove the plug from the battery case.
Pic. 9.5. Determination of electrolyte density on the hydrometer scale
3. Hold the hydrometer horizontally. Dial the pear of the device so much electrolyte from the battery that the float floats freely in it (pic. 9.5).