Milwaukee C66 Waterproof High Range Conductivity Pen with ATC and Replaceable Electrode

The Milwaukee Conductivity Pen is designed for hydroponic growers and others to help you make sure your plants are getting the right amount of nutrients. Keep conductivity within your target range to help you achieve better results.

EC electrodes can develop a build-up of nutrients over time. To reduce this build-up, always rinse the probe with tap water after each use.

The Milwaukee EC Pen, like all conductivity meters, provides a measurement of electrically charged ions in a solution and is an absolute measure of conductivity.

EC is often converted to TDS in parts per million (ppm). Different scales include 500, 650 and 700. However, true ppm can only be determined by chemical analysis.

Your reading in mS/cm can be approximately converted to TDS (ppm) as shown in the examples below.

2.00 mS/cm = 2000 uS/cm = 1000 ppm on the 0.50 scale

2.00 mS/cm = 2000 uS/cm = 1400 ppm on the 442 scale or on the 0.70 factor scale