GroLine Waterproof EC/TDS Pen

Get spot-on readings for your hydroponic nutrient solution with the Hanna GroLine Waterproof EC/TDS Tester. This pocket-size tester is simple and easy to use with only two buttons, one for power and the other for calibration. Get readings fast with the large LCD screen that reads the electrical conductivity (EC) or total dissolved solids (TDS). Features a graphite sensor to reduce the polarization effect often seen with testers that use two stainless steel pins.