Conductivity Pen - EC or ppm Subsonic Harmonic HPS grow lights have a

HPS grow lights have a good spectral distribution however

revive stressed plants and produce abundant yields with Superthrive

staggering

Made in Germany

Conductivity Pen - EC or ppm Subsonic Harmonic HPS grow lights have aThe Bluelab ppm Pen simply tells you that your plants have the right amount of nutrients in your solution and lets you know if adjustments are needed. To feed plants well, we need to know what we're feeding them. Start with a quality nutrient. Measuring the conductivity every day is the best way to avoid over diluting or over concentrating your nutrient solution. Completely change the reservoir solution every 7 days. Top up the nutrient level between