Quick view HM Digital HM Digital ORP-200 Waterproof ORP Meter MSRP: S/429.10 S/300.37 ORP-200: Waterproof ORP Meter Ideal for all ORP testing, including anti-oxidant measurement, water purification applications, ionizers, agriculture, aquariums & aquaculture, chlorine monitoring,... MSRP: S/429.10 S/300.37 Add to Cart The item has been added Add to Wish list