EC 1.413 Calibration/Box of 25 Sachets (CAL-3)MILWAUKEE WATERPROOF PENS The Milwaukee Waterproof Pen series of EC, TDS (PPM) and pH pens allow you to monitor your nutrient solution for best plant growth. They all feature replaceable electrodes for long life. The batteries will last 1500 hours of use. The pH pen will measure from 0 to 14.0 pH. The EC and TDS pens have automatic temperature compensation for accurate readings. The TDS pen will measure from 0 to 2000 P.P.M. and the EC pen will measure from 0.00 to 10.00 EC. They have a 2 year warranty on the pen and 6 month warranty on the electrode. Calibration solutions for these pens come in a box of 25 sachets. Placing your pH pen in storage solution will lengthen the life of your electrode. The pH pen can be calibrated at 7.01 and/or 4.01. Each pen comes complete with 3 batteries
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