{"product_id":"oakton-buffer-solution-ph-4-01-nist-traceable-1-gal","title":"Oakton Buffer Solution pH 4.01 - NIST-Traceable 1 gal","description":"\u003cp\u003eIn this review of the Oakton Buffer Solution, pH 4.01, the bottom line is simple: it is a dependable calibration standard for labs and field technicians who need a stable, traceable acidic buffer in larger volumes. The reviewer found it most valuable where frequent pH instrument calibrations are required and where having a full gallon reduces refill frequency. Its NIST traceability and ISO 9000 manufacturing pedigree are the single biggest reasons to consider it for regular calibration routines.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNIST traceable:\u003c\/strong\u003e The solution is traceable to NIST standard reference materials, giving labs documented confidence in calibration accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH 4.01 value:\u003c\/strong\u003e The USA buffer value of pH 4.01 matches the acidic calibration point commonly required for pH meter checks and titration workflows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH\/temperature table:\u003c\/strong\u003e Labels include pH\/temperature tables for accurate calibrations so users can account for temperature effects during calibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO quality manufacturing:\u003c\/strong\u003e Manufactured under ISO 9000 guidelines, the product suits regulated environments that require consistent production controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColored for quick ID:\u003c\/strong\u003e The red color coding allows quick-glance recognition of the pH 4.01 solution without affecting accuracy or stability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Oakton pH 4.01, 1 gal, is aimed at environmental labs, water treatment facilities, teaching labs, and any operation that performs frequent pH calibrations and prefers buying in bulk to minimize downtime. It suits users who need documented traceability to NIST standards and consistent quality control under ISO manufacturing.\u003c\/p\u003e\u003cp\u003eIt is less appropriate for someone who only performs occasional calibrations or needs very small, portable bottles; smaller 60-mL options exist for single-use field checks. Also, users who require single-use unopened-shelf lifespans beyond the stated limits should consider inventory practices to ensure buffers are used within recommended periods.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTraceability to NIST standards provides reliable documentation for audits and quality systems.\u003c\/li\u003e\n\u003cli\u003eIncluded pH\/temperature table on the label helps produce more accurate calibrations in varied conditions.\u003c\/li\u003e\n\u003cli\u003eLarge 1 gal size reduces purchase frequency for busy labs and facilities.\u003c\/li\u003e\n\u003cli\u003eColor coding makes identification quick during multi-buffer setups.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOnce opened, recommended use periods (90 days for pH 4 and pH 7) mean larger bottles must be managed to avoid waste.\u003c\/li\u003e\n\u003cli\u003eNot ideal for field technicians who need small, highly portable volumes for single checks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eOakton Buffer Solution, pH 4.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e1 gal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTraceability\u003c\/td\u003e\n\u003ctd\u003eTraceable to NIST standard reference materials\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturing Standard\u003c\/td\u003e\n\u003ctd\u003eManufactured under ISO 9000 guidelines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLabel Information\u003c\/td\u003e\n\u003ctd\u003epH\/temperature tables printed on label (insert for 60-mL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eRed color-coded (no effect on accuracy)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShelf Life\u003c\/td\u003e\n\u003ctd\u003eUnopened 2 years; once opened use pH 4 and pH 7 within 90 days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Oakton pH 4.01, 1 gal buffer is a practical, cost-effective choice for labs and facilities that require frequent, documented pH calibrations. Its NIST traceability and ISO 9000 manufacturing make it a defensible selection for quality-focused environments, though buyers should plan inventory to use opened bottles within the recommended timeframes to avoid waste.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow long can this buffer be used after opening?\u003c\/strong\u003e\u003cbr\u003eOpen bottles: pH 4 and pH 7 buffers are recommended for use within 90 days; pH 10 within 30 days.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the red color affect pH readings?\u003c\/strong\u003e\u003cbr\u003eNo, the buffer is colored for quick identification and the color does not affect accuracy or stability.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a pH\/temperature reference included?\u003c\/strong\u003e\u003cbr\u003eYes, pH\/temperature tables are printed on the bottle label (60-mL bottles receive the table as an insert).\u003c\/p\u003e","brand":"Oakton","offers":[{"title":"Default Title","offer_id":48619988451547,"sku":"B003M1JGLI","price":62.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/31rgOeBaIEL.jpg?v=1778510797","url":"https:\/\/gearmusthave.com\/products\/oakton-buffer-solution-ph-4-01-nist-traceable-1-gal","provider":"GearMustHave","version":"1.0","type":"link"}