The machine is designed for checking under- and over-filling of sulphuric acid in automotive batteries. The individual batteries supplied through the conveyor of the finishing line are positioned exactly. The fill stroke moves down and the levelling heads are lowered into the filling holes of the battery. The first station checks the acid level in the battery. If a battery is under filled it will be top-up the level, if a battery is overfilled it remove the acid out of the battery with diaphragm pumps. As a result, the acid level is accurate in all the individual cells due to an intelligent tungsten electrode system in each head for monitoring. The second station will check the levelling unit by lower the Check heads with a distance measuring system until each electrode contact with acid. The result will be displayed on the HMI for verification. An exact level achievement is guaranteed. If a battery failed it will be rejected on a table.