Emerald Harvest® pH Down Size:2.5 Gallon There is a third button

There is a third button in the battery compartment that allows the user to customize the meter to their preference

and environmental conditions

Light Feeding: Mix 1 teaspoon (5 mL) per gallon of water

Bloomerang T5 Two Footers work exceptionally well with seedlings

Emerald Harvest® pH Down Size:2.5 Gallon There is a third buttonEmerald Harvest pH Down Keep your nutrient solution in the sweet spot with Emerald Harvest pH Down. A pH reading above 6. 5 is considered too alkaline for most hydroponic gardens. This premium pH acidifier allows you to reduce the pH of your nutrient solution. Use pH Down as needed for guaranteed professional results. EMERALD HARVEST PRODUCT GUIDE