Sartorius PT-10 Mode D'emploi page 12

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5. Store pH electrodes in KCl solution or electrode
storage solution. Always leave the filling hole
open when in use and closed when in storage.
Refill with filling solution when the internal
solution drops to 1 inch below the filling hole.
!
PT-10P/PT-10-P20 models: The electrode
supplied is a low-maintenance gel-filled
electrode which cannot be re-filled.