Bluelab pH 4.0 Calibration Solution – 250 ml / 500 ml Accurate Calibration for Every Bluelab pH Instrument Keep your Bluelab pH meters, pens, and probes performing at their best with the Bluelab pH 4.0 Calibration Solution. Designed specifically for all Bluelab pH products, this solution ensures precise, reliable readings every time you measure your nutrient or water pH. ✅ Why Calibration Matters To maintain accuracy, all pH instruments should be cleaned and calibrated at least once a month. Calibration is performed first with pH 7.0 (buffer) and then with pH 4.0 (slope) — and this solution provides the correct standard for that second step. ⚗️ Features & Benefits Ensures accurate and stable pH readings for Bluelab instruments NIST-certified and manufactured to traceable laboratory standards Essential for calibrating Bluelab pH Probes, Pens, and Monitors Helps your Bluelab tools last longer and stay reliable Available in 250 ml and 500 ml bottles for convenient use 🧴 Best Use Practices To keep your calibration solution pure and effective: Avoid cross-contamination Pour a small amount into a clean plastic cup before use Discard any used sample after testing Store in a cool, dark place with the lid tightly closed Keep out of reach of children 🌱 Trusted by Growers Worldwide Bluelab solutions are made with precision to support professional growers who demand consistency and accuracy in hydroponics, horticulture, and soil applications. Perfect for: All Bluelab pH meters, pens, and probesSizes available: 250 ml | 500 mlOrigin: Manufactured to NIST-traceable standards for Bluelab instruments
