The MULi6s Module is a sensor designed to monitor the Li-XX battery voltage, which measures the voltage of each battery cell via the balance connector. It allows you to monitor the voltage of up to 6 Li-XX cells per module.
MULi 6S EX is a sensor for checking voltage of Li-XX batteries that checks the voltage by service connector of every single cell. It allows you to check the voltage up to 6 Li-XX cells.