Certified Pool Operator Practice Test 2026 - Free Pool Operator Practice Questions and Study Guide

Question: 1 / 400

Oxidation Reduction Potential (ORP) testing is measured in what units?

MV

ORP testing measures the oxidation reduction potential and is represented by the symbol E. The unit of measurement for ORP is millivolts (mV). In contrast, PSI (pounds per square inch) is a unit for measuring pressure, PPM (parts per million) is a unit for measuring concentration, and Watts is a unit for measuring power. Therefore, options B, C, and D are incorrect as they measure different properties that are not relevant to ORP testing.

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PSI

PPM

Watts

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