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

Overall Length: 11.75?, Overall Blade Length: 6.50", Cutting Edge Length: 5.75? | Blade Thickness: .188?, Grind: Full Flat, Drop Point Blade, Finish: Textured Powder Coat | Blade Steel: 1095 Carbon, 55-57 RC, Weight: 13 Oz (Knife),18 Oz (Knife, Sheath) | Handle: 3D Contoured G10 / Micarta, Sheath: Ambidextrous Polymer Sheath, Clip Plate | "Best In The Industry" No Questions Asked Lifetime Guarantee, Made In The USA