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SOP for Operation and Calibration of Field Water Quality Instruments 6 <br />6. DISCUSSION <br />These procedures assume that the following types of instruments will be used: <br />• Digital or non - mercury- liquid -filled thermometer <br />• Portable, battery - operated pH meter <br />• Portable, battery- operated conductivity meter <br />• Portable, battery- operated DO meter <br />• Portable, battery- operated ORP meter <br />7. REFERENCES <br />Refer to the Owner's Manual for each instrument for specific calibration requirements. <br />4153A.140129 Whetstone Associates <br />