Are you looking for PH calibration solution kit? Our products will be your good choice. Seal packets design makes it easy to use and no need to measure, mix with water, bringing you more convenience. This is a very efficient and practical PH calibration solution kit, which will meet your needs very well. Features -Color:Assorted Color -Material:ABS -Size:7.00X6.00X0.50cm/2.75X2.36X0.20in -The package includes 6.86, 4.01 and 9.18 calibration solution powder for all pH needs. -Designed for portability, no need to measure, convenient for daily life. -Individual sized packets design make them can be tucked in drawer, bag or suitcase, lightweight and convenient. -Easy to use, open the packet and them mix the power with 250ml distilled water to star your labs. -The PH buffer powder has wide range of applications and fit for drinking water, aquarium, pool PH testing. Package list: 5 x ph4.01 buffer powders 5 x .86 buffer powders 5 x .18 buffer powders