HAPPY HARVEST 4.0 Calibration Fluid 250ml

Description

Happy Harvest pH 4.0 Calibration Fluid is a precise buffer solution standardized at pH 4.0 for calibrating pH meters used in hydroponics and soilless growing. Key Uses It maintains meter accuracy for low-pH readings, essential for hydro growers targeting solutions around 5.5, ensuring nutrients stay available and preventing deficiencies from drift. Pair it with pH 7.0 fluid for two-point calibration on advanced meters to cover the full hydro range. Application Rinse the probe in distilled water, submerge in the fluid for 5-10 minutes, enter calibration mode, and adjust until it reads exactly 4.0—recalibrate weekly or after frequent use. ​ Safety Notes Non-toxic but discard used portions to avoid contamination; store sealed in a cool, dark spot and never return probe-dipped fluid to the bottle.