The Bluelab Guardian is a constant indicator of the desired levels for Hydroponics, enabling the grower to optimise these parameters as the crop progresses through each growing phase. The Guardian removes the complexity of how each parameter relies on the other for outstanding growth. Our innovative monitor is a new method to water testing, help guard the success of your crops with immediate and accurate results. A flashing display lets you know if one parameter moves away from the ideal, allowing you to make the required adjustments quickly and effectively.