{"product_id":"bluelab-ph-4-0-calibration-solution-sachet-18ml","title":"Bluelab pH 4.0 Calibration Solution Sachet – 18 ml Single-Use Buffer for pH Meters \u0026 Pens","description":"\u003ch1\u003eBluelab pH 4.0 Calibration Solution – 18 ml Single-Use Sachet\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eKeep your pH meters, monitors, and pens reading accurately — every time.\u003c\/strong\u003e The Bluelab pH 4.0 Calibration Solution sachet delivers a precise acidic reference point for calibrating any pH testing device. Engineered for growers, lab technicians, and water quality professionals who can't afford a bad reading.\u003c\/p\u003e\n\u003cp\u003ePicture calibration day in your grow room or lab: no measuring, no mess, no wasted solution. Just tear open a sachet, dip your probe, calibrate in seconds, and discard. Fresh, accurate buffer every single time — no contamination risk from shared bottles.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003ePrecise pH 4.0 buffer\u003c\/strong\u003e — certified acidic reference point for accurate two- or three-point calibration\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eSingle-use 18 ml \/ 0.6 fl oz sachets\u003c\/strong\u003e — eliminates cross-contamination between calibrations\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eEasy tear-open design\u003c\/strong\u003e — no scissors needed; calibrate anywhere in seconds\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003ePortable sachet format\u003c\/strong\u003e — perfectly sized for on-the-go calibration and field testing\u003c\/li\u003e\n\u003cli\u003e␅ \u003cstrong\u003eCompatible with all Bluelab pH meters, monitors, and pens\u003c\/strong\u003e — and any BNC or standard pH probe\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eMade in New Zealand\u003c\/strong\u003e — Bluelab quality assurance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto tech-specs-table-wrapper\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBluelab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSolution Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH Calibration Buffer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH Value\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.0 (acidic reference point)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVolume per Sachet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18 ml \/ 0.6 fl oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle-use tear-open sachet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePH418B-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBarcode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9421024921460\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew Zealand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eWhen to Use pH 4.0 Buffer\u003c\/h2\u003e\n\u003cp\u003epH 4.0 solution is the \u003cstrong\u003eacidic calibration point\u003c\/strong\u003e used in two-point and three-point calibration routines. Use it alongside pH 7.0 (neutral) and optionally pH 10.0 (alkaline) buffer solutions for the most accurate calibration across your full measurement range. Calibrate before every use for best results.\u003c\/p\u003e\n\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHydroponics and indoor growing — nutrient solution pH management\u003c\/li\u003e\n\u003cli\u003eAquariums and aquaculture — water quality monitoring\u003c\/li\u003e\n\u003cli\u003eLaboratories and educational institutions\u003c\/li\u003e\n\u003cli\u003eEnvironmental and field water testing\u003c\/li\u003e\n\u003cli\u003eFood and beverage quality control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible With\u003c\/h2\u003e\n\u003cp\u003eWorks with \u003cstrong\u003eall Bluelab pH meters, pens, monitors, and controllers\u003c\/strong\u003e, as well as any third-party pH probe or meter requiring a pH 4.0 calibration buffer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: For best accuracy, use fresh solution for each calibration. Do not reuse sachets. Store in a cool, dry place away from direct sunlight.\u003c\/em\u003e\u003c\/p\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":42659712630871,"sku":"PH418B-1","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/files\/WhatsAppImage2026-04-03at3.46.17PM.jpg?v=1775246204","url":"https:\/\/getultimatenow.com\/products\/bluelab-ph-4-0-calibration-solution-sachet-18ml","provider":"Get Ultimate Now ","version":"1.0","type":"link"}