Hanna Instruments GroLine EC/TDS Tester HI98318Waterproof High Accuracy Automatic calibration Automatic shut off Long battery life Item description: The GroLine Waterproof EC TDS Tester is made specifically for hydroponics, provides a simple, inexpensive solution to measure fertilizer concentration in a nutrient solution. The EC TDS tester has a graphite sensor that reduces the polarization effect common with amperometric testers that use two stainless steel pins. Automatic calibration is achieved
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