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The Bluelab BLU2221 ppm pen provides a quick and easy way to ensure the productivity of your crops by ensuring they have the nutrients they need by measuring conductivity and temperature. The waterproof ppm pen measures conductivity on the ppm 500 and 700 scales and temperatures in Celsius and Fahrenheit. With an easy-to-read LCD display this ppm pen is an essential tool for a successful grow. Comes with one AAA alkaline battery.