If you are looking for pH meter buffer solution powder for precise calibration, then your search is over. Our product meets your needs. Sealed packaging ensures practicality and long-term use. Individually wrapped to maintain freshness until use. Features - Color: Assorted - Material: ABS - Size: 7.00 x 6.00 x 0.50 cm / 2.75 x 2.36 x 0.20 in - Includes calibration solution powders pH 4.01, 6.86, and 9.18; sufficient quantity for daily pH calibration needs - Compact and lightweight individual packets for easy portability and storage - Powder format in sealed packets has no shelf life; simply mix with distilled water before use - Easy to use—no measuring required. Mix each packet with 250 mL of distilled water - Suitable for calibrating pH meters used in drinking water, pools, aquariums, or hydroponics Package List: 5 x pH 4.01 buffer powder packets 5 x pH 6.86 buffer powder packets 5 x pH 9.18 buffer powder packets