The M. C. Miller Company
manufactures, in-house, two insulation checking instruments
under license from the Gas Electronics Company.
One of the instruments
(Gas Electronics Model 601) is used to check above ground
insulators, while the other instrument (Gas Electronics Model
702) is used to check buried (underground) insulators, via test
leads.
These patented
instruments have unique designs and they are highly-accurate and
ultra-rugged for cathodic protection field work.