{"product_id":"bluelab-ph-4-buffer-solution","title":"Bluelab pH 4 Buffer Solution | Calibration Solution for pH Meters \u0026 Pens | 250ml \u0026 500ml","description":"\u003ch2\u003e🌱 Calibrate with Confidence — Get Your pH Readings Right Every Time\u003c\/h2\u003e\n\u003cp\u003eAccurate pH readings start with proper calibration. The \u003cstrong\u003eBluelab pH 4 Buffer Solution\u003c\/strong\u003e is the essential slope reference used in every two-point calibration — working alongside pH 7.0 to make sure your Bluelab pH meter or pen is reading exactly where it should be. No guesswork. No drift. Just happy, healthy plants.\u003c\/p\u003e\n\n\u003ch3\u003e📦 Available Sizes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e250ml\u003c\/strong\u003e — Great for home growers doing regular monthly calibrations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500ml\u003c\/strong\u003e — Perfect for larger setups, commercial grows, or high-frequency use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e✅ Why Growers Choose This\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🎯 \u003cstrong\u003eTwo-point calibration essential\u003c\/strong\u003e — pH 4.0 is the slope reference that pairs with pH 7.0 for precise results\u003c\/li\u003e\n\u003cli\u003e🔬 \u003cstrong\u003eNIST-certified\u003c\/strong\u003e — referenced to internationally traceable laboratory standards\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eMade specifically for Bluelab products\u003c\/strong\u003e — no compatibility concerns, just reliable performance\u003c\/li\u003e\n\u003cli\u003e📅 \u003cstrong\u003eCalibrate monthly\u003c\/strong\u003e — or whenever your meter prompts you, to keep readings accurate\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eStart measuring immediately\u003c\/strong\u003e after calibration is complete\u003c\/li\u003e\n\u003cli\u003e🌿 \u003cstrong\u003eA must-have in every grower's toolbox\u003c\/strong\u003e — alongside conductivity and pH 7.0 solutions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🔧 How to Use\u003c\/h3\u003e\n\u003cp\u003eClean your pH probe first, then calibrate in two steps: set to \u003cstrong\u003epH 7.0\u003c\/strong\u003e (buffer), then to \u003cstrong\u003epH 4.0\u003c\/strong\u003e (slope). The process is the same for all Bluelab pH meters and pens — quick, simple, and consistent. Once done, you're ready to measure straight away.\u003c\/p\u003e\n\n\u003ch3\u003e💡 Tips to Keep Your Solution Fresh\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAlways decant into a small cup before use — never dip directly into the bottle\u003c\/li\u003e\n\u003cli\u003eDiscard used solution — don't pour it back in\u003c\/li\u003e\n\u003cli\u003eStore in a cool, dark place with the lid tightly sealed\u003c\/li\u003e\n\u003cli\u003eKeep out of reach of children\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e📐 Size Comparison\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e250ml\u003c\/td\u003e\n\u003ctd\u003eHome growers, monthly calibration\u003c\/td\u003e\n\u003ctd\u003e$20.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e500ml\u003c\/td\u003e\n\u003ctd\u003eCommercial grows, frequent use\u003c\/td\u003e\n\u003ctd\u003e$30.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003e🌿 Don't let inaccurate readings hold your grow back. Add the Bluelab pH 4 Buffer Solution to your cart and calibrate with confidence today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Bluelab","offers":[{"title":"250ml","offer_id":48269365706966,"sku":null,"price":20.0,"currency_code":"AUD","in_stock":true},{"title":"500ml","offer_id":48269365739734,"sku":null,"price":30.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/6097\/9158\/files\/BLUELABPH-4BUFFERSOLUTION250MLS.webp?v=1779047501","url":"https:\/\/growersdepot.com.au\/products\/bluelab-ph-4-buffer-solution","provider":"Growers Depot","version":"1.0","type":"link"}