Bluelab pH 4.0 Calibration Solution Meter Liquid for Hydroponics and Soil Testing Accurate Fluid All Probes Pens (250 ml)

Precision in a Compact Bottle: Ensure consistently accurate pH readings with this 250 ml pH 4.0 calibration solution. Ideal for growers who calibrate less frequently or need a space-saving option for mobile setups. Essential for Routine Maintenance: Protect the accuracy and lifespan of your pH meters with regular calibration. This solution is specially designed for all Bluelab pens and probes used in soil and hydroponic applications. Perfect for Small Grow Setups: Whether you’re running a compact grow tent or a home hydroponic system, the 250 ml bottle provides just the right amount for occasional use without waste. Supports Cleaning and Calibration: A clean probe ensures accurate readings. Use this solution alongside Bluelab cleaning instructions to restore precision and maintain reliable performance. Trusted by Indoor Gardeners Worldwide: Backed by Bluelab’s strong reputation, this solution is a must-have for hobby growers who want to keep their equipment in top condition.