<b>Easy to use</b>- No need to measure, just mix each packs with 250mL distilled water.
<b>Total 15 packs</b>-The set includes 5 package of 4.01, 5 package of 6.86 and 5 package of 9.18 calibration solution powder for all pH needs.
<b>Designed for portability</b>- Individual sized packets can be tucked in drawer, bag or suitcase for travel.,easy to carry.
<b>Save time and money</b>-By mixing powders in a jar of distilled water, this lets you keep them longer and more readily available without needing more packets!
<b>Wide range of applications</b>-Ideal for testing pH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics.