🔧 Elevate Your Lab Game with Precision Calibration! Perfect for pharmaceutical, academic, and industrial labs. Each gallon is individually bagged for protection. Lot numbered and expiration dated for reliability. Color-coded for quick and easy reference. Ensure accuracy with NIST traceable standards. Color-Coded 1 Gallon Size NIST Certified This pH Buffer Calibration Solution 2-Pack includes two 1-gallon bottles (pH 4.00 and pH 7.00) that are NIST traceable, ensuring the highest accuracy for your pH meters. Each bottle is color-coded for easy identification and comes with waterproof labels featuring lot numbers and expiration dates, making it ideal for use in pharmaceutical, academic, research, and industrial laboratories.