Contains 10 Sachets of M10007 - 7.01 pH, Accuracy +/- 0.01 pH @ 25 Degrees C, and 5 of each M10000, M10004 - 4.01 pH, Accuracy, +/- 0.01 @ 25 Degrees C and M10010 - 10.01 pH Accuracy, +/- 0.01 @ 25 Degrees C - 20 ml each