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The Bluelab EC Pen and Bluelab ppm Pen are the latest innovation for hand held conductivity meters and the ultimate handy solution for measuring conductivity. Hydroponic growing lets you give the best care possible to your plants. The quality of care is in your control. The Bluelab EC and ppm pens measure how much food the plant has available. You have the option of either the Bluelab EC Pen or the Bluelab ppm Pen. The Bluelab EC and ppm pens provide a compact, quick and handy way to manage the success of your crops to ensure they have the nutrients they need. Teamed with our Bluelab pH Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health. The Bluelab pH Pen, Bluelab EC Pen and Bluelab ppm Pen range has been specially developed as an affordable and effective option for hobby or small scale growers.