Specification Brand : Carolina BulletPoint1 : Reliable, nontoxic combination dip strip gives accurate quantitative values in seconds BulletPoint2 : Range: 0-5.0 ppm. BulletPoint3 : When you shop with Carolina, you're not alone! All of our products are backed by unparalleled technical support, available from 8am to 6:30pm, ET, Monday through Friday. Live chat is available from 8am to 5:30pm ET, Monday-Friday. Contact information (Live Chat, email, and phone) is provided after placing your order at Amazon. BulletPoint4 : ⏳Reset function: When the ph tester is powered on, press and hold the power button for 3 seconds, release it and when the ph tester digital screen displays: "--" it means the water ph tester reset is successful. BulletPoint5 : ⏳Power-off data storage function:The ph meter data is automatically saved after the battery is removed, and the storage time is one month. ExternallyAssignedProductIdentifier1 : 0840132654937 ExternallyAssignedProductIdentifier2 : 840132654937 IncludedComponents : 1 ItemName : Total Iron (Ferric/Ferrous) Water Test Strips (vial/25) ItemPackageDimensions_Height : 1.6 inches ItemPackageDimensions_Length : 7 inches ItemPackageDimensions_Width : 2.4 inches ItemPackageQuantity : 25 ItemTypeKeyword : ph-test-strips Manufacturer : Carolina Biological Supply Company NumberOfItems : 1 PartNumber : 652738 ProductDescription : Total Iron (ferric/ferrous) Water Test Strips. Reliable, nontoxic combination dip strip gives accurate quantitative values in seconds. Range: 0-5.0 ppm. Vial of 25. ProductSiteLaunchDate : 2012-04-18T13:17:01.178Z SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1