🔧 Elevate Your Calibration Game! Each bottle is packed with silica gel to keep your capsules fresh and effective. Clear instructions printed on each bottle make calibration a breeze. At just 50g, these capsules are perfect for on-the-go calibration. Ensure your pH meter is always spot on with our pH 4.0, 7.0, and 9.2 capsules. Easily distinguish between pH levels with our vibrant color-coded capsules. color-coded moisture-proof pH precision The Merck pH Buffer capsules set includes three bottles (pH 4.0, 7.0, and 9.2), each containing 10 easy-to-use capsules. Designed for precise pH meter calibration, these capsules are moisture-proof and color-coded for convenience, making them an essential tool for professionals in various fields.