ORP is commonly measured in which unit?

ORP, or Oxidation-Reduction Potential, is a measurement that indicates the cleanliness and sanitation level of water, particularly in pools and spas. It is expressed in millivolts. This unit is used because it reflects the voltage difference that results from the activity of oxidizing and reducing agents in the water, giving important insights into the chemical balance and effectiveness of sanitizers, such as chlorine.

Measuring ORP in millivolts allows pool operators to determine the effectiveness of disinfectants in keeping the water safe and clean. High ORP values typically indicate a strong oxidizing environment, which correlates with better water quality and sanitation.

Other units mentioned, such as amperes, millimeters, or percent, do not relate to the measurement of oxidation-reduction potential. Amperes are used to measure electric current, millimeters measure length, and percent expresses a ratio or fraction. Therefore, these measurements do not apply to the context of ORP in pool water management.