{"product_id":"hanna-ph-4-01-calibration-buffer-solution","title":"Hanna pH 4.01 Calibration Buffer Solution – HI7004L, HI5004 \u0026 HI6004","description":"\u003cdiv style=\"max-width: 1400px; margin: 0 auto; font-family: 'Open Sans', sans-serif; font-weight: 300; color: #333; background: #fff;\"\u003e\n\n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 40px; border-bottom: 1px solid #e0e0e0; padding-bottom: 40px; margin-bottom: 40px;\"\u003e\n    \u003cdiv style=\"flex: 1 1 500px; min-width: min(300px, 100%); text-align: center;\"\u003e\n      \u003cimg src=\"https:\/\/cdn11.bigcommerce.com\/s-l8qlnhq2eh\/images\/stencil\/1280x1280\/products\/7068\/10687\/ph-4-calibration-buffer-solution-hi7004L_box__53923.1615995654.jpg?c=2\" alt=\"Hanna HI7004L pH 4.01 calibration buffer solution, 500 mL\" style=\"width: 100%; max-width: 420px; height: auto; object-fit: contain; border-radius: 8px;\"\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex: 1 1 500px; min-width: min(300px, 100%);\"\u003e\n      \u003ch3 style=\"font-size: 1rem; font-weight: 400; margin: 0 0 20px 0;\"\u003e\u003cstrong\u003eAccurate Calibration on the Acidic Side\u003c\/strong\u003e\u003c\/h3\u003e\n      \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 16px 0;\"\u003e\u003cstrong\u003epH 4.01 is the calibration point for anything you measure below neutral.\u003c\/strong\u003e Paired with pH 7.01, it sets your meter or controller's slope across the acidic range, from water treatment and acid neutralization tanks to food, beverage, and wine testing.\u003c\/p\u003e\n      \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0;\"\u003e\u003cstrong\u003eEvery batch is NIST traceable,\u003c\/strong\u003e standardized with a meter calibrated against two solutions prepared from NIST standard reference materials. Choose the grade, size, and packaging that fits how you work.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-bottom: 1px solid #e0e0e0; padding-bottom: 40px; margin-bottom: 40px;\"\u003e\n    \u003ch4 style=\"font-size: 1rem; font-weight: 400; margin: 0 0 20px 0;\"\u003e\u003cstrong\u003eChoose Your Grade\u003c\/strong\u003e\u003c\/h4\u003e\n    \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 20px;\"\u003e\n      \u003cdiv style=\"flex: 1 1 240px; min-width: min(240px, 100%); border: 1px solid #e0e0e0; border-radius: 8px; padding: 20px; background: #f9f9f9;\"\u003e\n        \u003cp style=\"font-size: 1rem; margin: 0 0 12px 0;\"\u003e\u003cstrong\u003eStandard (HI7004 \/ HI8004)\u003c\/strong\u003e\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 6px 0;\"\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.01 pH @ 25 °C\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 6px 0;\"\u003e\u003cstrong\u003eCOA:\u003c\/strong\u003e On request, or included on COA versions\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0;\"\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Everyday calibration of meters, testers, and process controllers\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 240px; min-width: min(240px, 100%); border: 1px solid #e0e0e0; border-radius: 8px; padding: 20px; background: #f9f9f9;\"\u003e\n        \u003cp style=\"font-size: 1rem; margin: 0 0 12px 0;\"\u003e\u003cstrong\u003eTechnical (HI5004)\u003c\/strong\u003e\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 6px 0;\"\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.01 pH @ 25 °C\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 6px 0;\"\u003e\u003cstrong\u003eCOA:\u003c\/strong\u003e Included\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0;\"\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Routine lab work that needs documentation\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 240px; min-width: min(240px, 100%); border: 1px solid #e0e0e0; border-radius: 8px; padding: 20px; background: #f9f9f9;\"\u003e\n        \u003cp style=\"font-size: 1rem; margin: 0 0 12px 0;\"\u003e\u003cstrong\u003eMillesimal (HI6004)\u003c\/strong\u003e\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 6px 0;\"\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.002 pH @ 25 °C\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0 0 6px 0;\"\u003e\u003cstrong\u003eCOA:\u003c\/strong\u003e Included\u003c\/p\u003e\n        \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0;\"\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e High-precision lab measurement\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-bottom: 1px solid #e0e0e0; padding-bottom: 40px; margin-bottom: 40px;\"\u003e\n    \u003ch4 style=\"font-size: 1rem; font-weight: 400; margin: 0 0 24px 0;\"\u003e\u003cstrong\u003eBuilt-In Quality and Traceability\u003c\/strong\u003e\u003c\/h4\u003e\n    \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 28px 40px;\"\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/nist.jpg?width=150\u0026amp;name=nist.jpg\" alt=\"NIST traceable\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eNIST Traceable\u003c\/strong\u003e\u003cbr\u003eEach batch is standardized with a meter calibrated against two solutions prepared from NIST reference materials.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/product\/colored%20buffer%20solutions.jpg?width=150\u0026amp;name=colored%20buffer%20solutions.jpg\" alt=\"Color-coded buffer solutions\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eColor-Coded Options\u003c\/strong\u003e\u003cbr\u003eSelect versions include a dye, so you can tell your buffers apart at a glance.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/Certificate.jpg?width=150\u0026amp;name=Certificate.jpg\" alt=\"Certificate of analysis\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eCertificate of Analysis\u003c\/strong\u003e\u003cbr\u003eIncluded with Technical, Millesimal, and COA versions, and available on request for the rest.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/Temp-Table.jpg?width=150\u0026amp;name=Temp-Table.jpg\" alt=\"Lot number and expiration date\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eLot and Expiration Info\u003c\/strong\u003e\u003cbr\u003eEvery bottle and sachet is printed with its batch number and expiration date.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/product\/temp%20chart.jpg?width=150\u0026amp;name=temp%20chart.jpg\" alt=\"pH versus temperature reference table\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eTemperature Reference Table\u003c\/strong\u003e\u003cbr\u003eThe label lists the buffer's pH at each temperature, so you can calibrate accurately away from 25 °C.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/008-general\/hannainst_may2016\/images\/msds-icon.png?width=150\u0026amp;name=msds-icon.png\" alt=\"Safety data sheet\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eSafety Data Sheets\u003c\/strong\u003e\u003cbr\u003eSDS documentation is available on request for every version.\u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-bottom: 1px solid #e0e0e0; padding-bottom: 40px; margin-bottom: 40px;\"\u003e\n    \u003ch4 style=\"font-size: 1rem; font-weight: 400; margin: 0 0 24px 0;\"\u003e\u003cstrong\u003ePackaging to Fit How You Work\u003c\/strong\u003e\u003c\/h4\u003e\n    \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 28px 40px;\"\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/sachet.jpg?width=150\u0026amp;name=sachet.jpg\" alt=\"Single-use buffer sachets\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eSingle-Use Sachets\u003c\/strong\u003e\u003cbr\u003eEach sealed 20 mL sachet is as fresh as the day it was filled. Ideal for field work, testers, and portable meters.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/standard.jpg?width=150\u0026amp;name=standard.jpg\" alt=\"Buffer solution bottle\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eBottles\u003c\/strong\u003e\u003cbr\u003eFrom 230 mL to 1 gallon, opaque to block light and sealed airtight with a tamper-evident cap.\u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 300px; min-width: min(260px, 100%); display: flex; align-items: center; gap: 16px;\"\u003e\n        \u003cimg src=\"https:\/\/cdn2.hubspot.net\/hubfs\/2134380\/001-website\/images\/fda.jpg?width=150\u0026amp;name=fda.jpg\" alt=\"FDA bottle\" style=\"width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0;\"\u003e\n        \u003cdiv style=\"font-size: 1rem; line-height: 1.6;\"\u003e\n\u003cstrong\u003eFDA Bottles\u003c\/strong\u003e\u003cbr\u003eAirtight, opaque, tamper-evident bottles for food, beverage, and other regulated environments.\u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background: #f9f9f9; border: 1px solid #e0e0e0; border-radius: 8px; padding: 24px;\"\u003e\n    \u003ch4 style=\"font-size: 1rem; font-weight: 400; margin: 0 0 12px 0;\"\u003e\u003cstrong\u003eTip for Accurate Results\u003c\/strong\u003e\u003c\/h4\u003e\n    \u003cp style=\"font-size: 1rem; line-height: 1.6; margin: 0;\"\u003eOnce opened, a pH 4 buffer can grow mold or bacteria, which shifts its value. Pour out only what you need, recap the bottle right away, and never pour used buffer back in. If the solution turns cloudy or shows growth, replace it. For the most reliable results, use sachets or a freshly opened bottle.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n","brand":"Hanna Instruments","offers":[{"title":"HI7004L – Standard – 500 mL Bottle","offer_id":52721193353514,"sku":"BTS-HI7004L","price":25.29,"currency_code":"USD","in_stock":true},{"title":"HI7004M – Standard – 230 mL Bottle","offer_id":52721193386282,"sku":"BTS-HI7004M","price":21.84,"currency_code":"USD","in_stock":true},{"title":"HI7004C – Standard – 500 mL Bottle (color coded)","offer_id":52721193419050,"sku":"BTS-HI7004C","price":25.29,"currency_code":"USD","in_stock":true},{"title":"HI7004L\/C – Standard – 500 mL Bottle, COA","offer_id":52721193451818,"sku":"BTS-HI7004L\/C","price":29.89,"currency_code":"USD","in_stock":true},{"title":"HI7004\/1L – Standard – 1 L Bottle (color coded)","offer_id":52721193484586,"sku":"BTS-HI7004\/1L","price":78.19,"currency_code":"USD","in_stock":true},{"title":"HI7004\/1G – Standard – 1 gal Bottle (color coded)","offer_id":52721193517354,"sku":"BTS-HI7004\/1G","price":49.44,"currency_code":"USD","in_stock":true},{"title":"HI70004P – Standard – 20 mL Sachets (25 pcs.)","offer_id":52721193550122,"sku":"BTS-HI70004P","price":40.24,"currency_code":"USD","in_stock":true},{"title":"HI70004C – Standard – 20 mL Sachets (25 pcs.), COA","offer_id":52721193582890,"sku":"BTS-HI70004C","price":54.04,"currency_code":"USD","in_stock":true},{"title":"HI8004L – Standard – 500 mL FDA Bottle","offer_id":52721193615658,"sku":"BTS-HI8004L","price":51.74,"currency_code":"USD","in_stock":true},{"title":"HI8004L\/C – Standard – 500 mL FDA Bottle, COA","offer_id":52721193648426,"sku":"BTS-HI8004L\/C","price":51.74,"currency_code":"USD","in_stock":true},{"title":"HI5004 – Technical – 500 mL Bottle, COA","offer_id":52721193681194,"sku":"BTS-HI5004","price":45.99,"currency_code":"USD","in_stock":true},{"title":"HI5004-R – Technical – 500 mL Bottle (color coded), COA","offer_id":52721193713962,"sku":"BTS-HI5004-R","price":45.99,"currency_code":"USD","in_stock":true},{"title":"HI5004-R08 – Technical – 1 gal Bottles (2 pcs., color coded), COA","offer_id":52721193746730,"sku":"BTS-HI5004-R08","price":143.74,"currency_code":"USD","in_stock":true},{"title":"HI50004-02 – Technical – 20 mL Sachets (25 pcs.), COA","offer_id":52721193779498,"sku":"BTS-HI50004-02","price":65.54,"currency_code":"USD","in_stock":true},{"title":"HI6004 – Millesimal – 500 mL Bottle, COA","offer_id":52721193812266,"sku":"BTS-HI6004","price":51.74,"currency_code":"USD","in_stock":true},{"title":"HI6004-01 – Millesimal – 1 L Bottle, COA","offer_id":52721193845034,"sku":"BTS-HI6004-01","price":65.54,"currency_code":"USD","in_stock":true},{"title":"HI60004-02 – Millesimal – 20 mL Sachets (25 pcs.), COA","offer_id":52721193877802,"sku":"BTS-HI60004-02","price":78.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/1579\/4474\/files\/ph-4-calibration-buffer-solution-hi7004L_box__53923.1615995654.jpg?v=1790019710","url":"https:\/\/bluetigerscientific.com\/products\/hanna-ph-4-01-calibration-buffer-solution","provider":"Blue Tiger Scientific","version":"1.0","type":"link"}