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The Aqua TROLL Rhodamine WT Sensor improves accuracy of tracer studies with patented Integrated Optical Compensation. This new technology provides stability at lower detection limits for more detailed river, coastal and groundwater studies. The Rhodamine WT Sensor is compatible with the Aqua TROLL 500 or Aqua TROLL 600 mutiprobes, which offer wireless Bluetooth® data collection and mobile app.