unbrand 3Pcs pH Buffer Powder for pH Calibration 4.01pH 6.86pH 9.18pH 250ml Solution

Features: 3 packs of popular pH buffer solutions, pH4.01, pH6.86 and pH9.18 Simple to use. Just add 250ml per powder packet Powder has an indefinite shelf life Easy 3-step procedure is written at the back of the packet Each powder packet/sachet makes 250ml of solution (when mixed with distilled or deionized water) Specifications: Each pack volume: 250 ml. Each powder packet/sachet makes 250ml of solution (when mixed with distilled or deionized water) Accuracy: 0.01pH at 25C Size: 7.5x6.5cm Quantity: 3 Pcs/1 Set Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x pH4.01 Calibration Powder 1 x pH6.86 Calibration Powder 1 x pH9.18 Calibration Powder