🌱 Elevate Your Growth Game with Precision! Includes a FREE 'How to Use' guide for effortless calibration. Perfect for hydroponics, aquariums, and pools. Durable labels ensure clarity in any environment. Individually bagged 250 mL bottles for easy storage. Achieve accurate readings for optimal growth. pH 7.00 Buffer pH 4.00 Buffer Electrode Storage Solution The pH Buffer Calibration Kit 3-pack includes 250 mL bottles of pH 4.00 and pH 7.00 buffers, along with an electrode storage solution, designed for precise calibrations in hydroponics, aquaponics, and aquariums. Each kit comes with waterproof labels and a helpful guide, ensuring you achieve optimal pH levels effortlessly.