For multivalent ions, it is usual to consider the conductivity divided by the equivalent ion concentration in terms of equivalents per litre, where 1 equivalent is the quantity of ions that have the same amount of electric charge as 1 mol of a monovalent ion:  mol Ca2+,  mol ,  mol Al3+,  mol , etc.
When dealing with ions that have multiple charges, it's common to express conductivity in terms of equivalents per liter, where one equivalent is the quantity of ions carrying the same electric charge as one mole of a monovalent ion: moles Ca2+, moles , moles Al3+, moles , and so on.