Bluelab Conductivity Pen Top Seller Sulfur deficiency can disrupt this

Sulfur deficiency can disrupt this balance and redirect resources towards other metabolic pathways

and a product manual

5% Ammoniacal Nitrogen

Hydroponics/hydroculture - used widely in hydroponic growing

Athena Balance is not recommended for electronic dosing systems (Netafim)

Bluelab Conductivity Pen Top Seller Sulfur deficiency can disrupt thisBluelab Conductivity Pen A robust handheld solution for measuring conductivity and temperature on the go Fully waterproof, not just water resistant Selectable measurement units so you can customise with your preferences Flat electrode for easier cleaning and maintenance Hold reading function to capture every measurement with ease Automatic temperature compensation for accurate readings anywhere Auto off function to extend battery life 1 x AAA alkaline