1 mS (millisiemens) = 1,000 µS/uS (microsiemens) = 1 EC



For example:


1500 µS = 1.50 mS = 1.50 EC


2.85 mS = 2.85 EC = 2,850 µS


5.90 mS = 5.90 EC = 5,900 µS



On most Apera testers, µS will be automatically switched to mS at the point it reaches 2,000 µS.