Calibration Solutions are used to calibrate your meter for optimal accuracy

Replaceable 9 volt battery included

It's a straightforward solution for gardeners looking to give their plants exactly what they need

and transition to Holland Secret Bloom as your plants enter the flowering phase

drastically increased flower set

Organical Magic - Organic CalMag Size:10L / 2.5 Gallon Calibration Solutions are used toProduct Description Organical Magic is a water soluble Calcium Magnesium enhancer derived from naturally occurring minerals. It's designed to be immediately available to your crop, making it superior to other organic sources which can require time to become available. By using Organical Magic, you can strengthen plant cells and tissues, increase flower and fruit sets, and boost chlorophyll production. This OMRI listed product is suitable for organic