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Underground electrical resistance (ER) probes are designed for underground and structural monitoring of pipelines, vessels, above and below ground storage tanks and structures — whether cathodically protected or not. The Model 620HD is a heavy duty assembly with a check element which is suited to the “construction site” environment. The Model 650 ER probe is economical and durable. Its slim profile is convenient for locations with restricted access such as concrete bridge structures and other infrastructure applications. 





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