Oakton, WD-98767-73, Buffer Solution Kit, Clear, pH 4.005, 7.000, and 10.012Includes:Individual temperature compensation chartNIST-Traceable calibration certificate with dataFeaturesAll Oakton® Traceable® pH buffer solutions are NIST-traceable reference materialsSupplied with calibration report from an ISO Guide 34 and ISO 17025 accredited laboratoryIndividually packed in foil pouch to prevent UV exposure that may degrade accuracyBuffer solution lets you calibrate pH instruments to ensure accuracyConvenient kit includes the most common calibration valuesColor-coded buffer for easy identificationConvenient, single-use vials eliminate concerns of cross-contamination; each pack contains six polyethylene vials with 100-mL of pH buffer per vialIf unopened, shelf life is 2 years; once opened, use pH 4 and pH 7 within 90 days, pH 10 within 30 daysCertified reference material meets test requirements for Federal, State, and local agencies, CAP, ASTM, NCCLS, CLSI, ACS, CLIA, AOAC, EPA, APHA, AWWA, WEF, USGS, USP, and ISO. Traceable® Conductivity Standards complies with and is essential for use in these official methods: AOAC 973.40, EPA 120.1, Standard Method 2510 (APHA, AWWA, WEF), ISO 7888, DIN 38404, ASTM D1125, USGS I-1780, USP 645, and for A2LA/NVLAP accreditations/ISO 9000 certifications. Material may be used to calibrate all conductivity meters and to determine all conductivity cell constants.A2LA Accreditation ISO/IEC 17025:2005 (1750.01)To assure accuracy an individually serial-numbered Traceable® Certificate is supplied to indicate traceability to standards provided by NIST (National Institute of Standards and Technology) and/or a National Standards Laboratory. A2LA accredited certification provides the highest achievable level of quality assurance, documentation, and accuracy. Conductivity Standards are produced in an A2LA accredited ISO/IEC 17025:2005 (1750.01) calibration laboratory. Additional certifications include ISO 31 (certificate content) and ISO 35 (statistical analysis), plus ISO 9001 (certified quality manufacturer).Unit of MeasurePack of 6 pcs.