ORP Monitors, TDS Meters |Hydrogen, pH, Chlorine Testers Quick ViewReagent: pH Long Range Indicator | Enagic® CAD $6.57 Quick ViewReagent: Hydrogen Test | H2Blue Eco CAD $33.57 Quick ViewReagent: Chlorine Test | Pentair Rainbow From: CAD $3.97 Quick ViewMeter: PINPOINT ORP Monitor | American Marine CAD $179.57 Quick ViewMeter: MW500 ORP | Milwaukee CAD $159.57