![Bluelab® Conductivity Pen](http://lvhydro.com/cdn/shop/products/HGC716482-01_{width}x.jpg?v=1656093671)
With the Bluelab Conductivity Pen (EC or ppm) you'll never have to guess your nutrient concentration again. This is the ultimate solution to measuring EC or PPM, along with temperature, and dialing in your nutrient solution for explosive growth and heavy yields.