Calira Sealine panel 420 question

[Haveago]

Hi - could anyone help me identify what the icons circled in red in the attached photo (from my 2001 Bav 31)  control panel refer to?  Probably a really stupid question!

[symphony2]

Select water tanks 1 or 2 - if you have 2 tanks. If you only have one tank you will get a reading if you press the one on the left. Same with the voltmeters for the batteries.

[diverphil]

from left to right battery no1, battery no2, low battery warning , mains connection. tank level no1 , tank level no2.
they are the same signs on ours but in a different position, guess that when you push the switch the reading comes up on the digital display.
have you tried google for a manual, or there may be one on here if you use the search box.
regards
phil

[Haveago]

Brilliant - thanks diverphil and symphony2