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Graph
Tap the Graph icon on the left-hand side of the screen to toggle 
between displaying and not displaying a graph of your measurement.
Battery
This icon indicates the Surtronic 
S-Series current battery life.
This icon indicates the Surtronic 
S-Series battery is charging
Memory
Internal memory
This icon indicates the activated mode 
where any measured data is saved to 
internal memory of the unit.
External memory
This icon indicates the activated mode 
where any measured data is saved to an 
external memory Storage device such 
as a USB data stick.