Connect an external alarm to the Electrode Selector 
ES 10-64eC / ES10-64C / ES 464 and it will indicate 
by sound / flashing light or both when it is time for 
next roll-a-long. It can also indicate when it is time 
to start the next protocol or if the full measurement 
is done. The Alarm will also indicate if the 
measurement is interrupted by any cause. For more 
information contact your local ABEM distributor or 
ABEM directly.