A professional who measures resistance of earth formations to electrical charges, using electrical apparatus to obtain data for locating rock strata favorable to further petroleum exploration activities. Responsibilities include:

• Transports electrical equipment and instruments to designated locations, and directs and assists in laying out and connecting cables, electrodes, instrument panels, and other electrical equipment.
• Adjusts electrical instruments to eliminate electrical interferences from earth currents or weather conditions.
• Opens and closes circuits to send electrical current through electrodes into earth.
• Reads dials and records data of millivoltmeter readings at various receptor points along cable to detect loss of potential due to resistance of earth formations.
• Diagnoses cause of malfunctioning of instruments and cables and makes repairs.