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Hi, saw what look like meters at the bottom of some lightning arresters for a transformer in a main outdoor substation.  I've never seen them before, anyone know what they are or used for?  Some sort of sensing or indication if there is a surge perhaps?  Thanks!

Hello! Starting to get ready to take my PE test, and was hoping to get some idea on which test I should take. I studied Electronics in college, and passed the Electronics EIT test. I graduated in 2005 and been practicing Power engineering at my job the last 10 years. I work for an electrical...