{"product_id":"flairform-ph-buffer-4","title":"pH Buffer 4.0 by Flairform — pH Meter Calibration Solution","description":"\u003cdiv style=\"font-family: 'Helvetica Neue', Arial, sans-serif; max-width: 860px; margin: 0 auto; color: #1a1a1a;\"\u003e\n\u003cp style=\"font-size: 1.05rem; line-height: 1.7; margin-bottom: 1.5rem;\"\u003eFlairform pH Buffer 4.0 is a calibration solution for pH meters, made to the internationally agreed recipe with NIST-specified ingredients. pH meters must be calibrated regularly to stay accurate — and professional practice calls for two buffers, not one. Paired with pH Buffer 7.0, this gives you a true 2-point calibration that confirms your electrode and meter are ranging correctly across the whole scale. Stabilised against algae growth for exceptional shelf life. Available in 250ml and 1L.\u003c\/p\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 2rem;\"\u003e\n\u003cdiv style=\"background: #f4f9f4; border-left: 4px solid #2e5e2e; padding: 1rem 1.2rem; border-radius: 6px;\"\u003e\n\u003cstrong style=\"display: block; margin-bottom: 0.3rem; color: #2e5e2e;\"\u003eNIST-Specified Ingredients\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eFormulated to the internationally agreed buffer recipe — your meter calibrates against a genuine analytical reference.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f4f9f4; border-left: 4px solid #2e5e2e; padding: 1rem 1.2rem; border-radius: 6px;\"\u003e\n\u003cstrong style=\"display: block; margin-bottom: 0.3rem; color: #2e5e2e;\"\u003eHalf of the Ideal 2-Point Pair\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eBuffers 4.0 and 7.0 are the ideal calibration standards for nutrient solutions — three pH units apart, confirming the slope.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f4f9f4; border-left: 4px solid #2e5e2e; padding: 1rem 1.2rem; border-radius: 6px;\"\u003e\n\u003cstrong style=\"display: block; margin-bottom: 0.3rem; color: #2e5e2e;\"\u003eStabilised Against Algae\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eGrowths contaminate electrodes and distort calibration. This buffer resists them for exceptional shelf life.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f4f9f4; border-left: 4px solid #2e5e2e; padding: 1rem 1.2rem; border-radius: 6px;\"\u003e\n\u003cstrong style=\"display: block; margin-bottom: 0.3rem; color: #2e5e2e;\"\u003eSafe to Handle\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eNon-hazardous, non-corrosive and a non-dangerous good per the safety data sheet — no PPE needed in normal use.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 1.1rem; font-weight: bold; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem 2rem; margin-bottom: 2rem; font-size: 0.95rem;\"\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Flairform\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 250ml and 1L\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBuffer value:\u003c\/strong\u003e pH 4.0\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e Potassium hydrogen phthalate (aqueous)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWhen to use:\u003c\/strong\u003e Calibrating pH electrodes\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSafety:\u003c\/strong\u003e Non-hazardous, non-corrosive, non-dangerous good\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff8e1; border-left: 4px solid #f9a825; padding: 1rem 1.3rem; border-radius: 6px; margin-bottom: 2rem;\"\u003e\n\u003cstrong style=\"color: #e65100; display: block; margin-bottom: 0.5rem;\"\u003eGrow Guys Tip — Calibrate Like a Lab\u003c\/strong\u003e\n\u003cul style=\"margin: 0 0 0 1.2rem; padding: 0; font-size: 0.93rem; line-height: 1.7;\"\u003e\n\u003cli\u003eAlways calibrate 2-point: pH 7.0 first, then 4.0. Single-point calibration on 7.0 alone can't confirm the slope — some meter brands claim it's enough, professional practice says otherwise.\u003c\/li\u003e\n\u003cli\u003eNever dip the probe into the bottle. Decant a small amount into a clean cup and discard it after use — dipping contaminates the whole bottle.\u003c\/li\u003e\n\u003cli\u003eKeep the bottle closed and stored cool and dark. Contaminated or degraded buffer means calibrating to a wrong reference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 1.1rem; font-weight: bold; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003eHow to Use\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 2rem;\"\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px; padding: 12px 0; border-bottom: 1px solid #edf3ed; font-size: 0.93rem; line-height: 1.6;\"\u003e\n\u003cspan style=\"background: #2e5e2e; color: #fff; font-weight: bold; font-size: 0.85rem; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px;\"\u003e1\u003c\/span\u003e\n\u003cdiv\u003eClean the electrode first — a fouled probe calibrates to bad numbers.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px; padding: 12px 0; border-bottom: 1px solid #edf3ed; font-size: 0.93rem; line-height: 1.6;\"\u003e\n\u003cspan style=\"background: #2e5e2e; color: #fff; font-weight: bold; font-size: 0.85rem; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px;\"\u003e2\u003c\/span\u003e\n\u003cdiv\u003eCalibrate the first point in pH Buffer 7.0 per your meter's manual, then rinse the probe.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px; padding: 12px 0; border-bottom: 1px solid #edf3ed; font-size: 0.93rem; line-height: 1.6;\"\u003e\n\u003cspan style=\"background: #2e5e2e; color: #fff; font-weight: bold; font-size: 0.85rem; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px;\"\u003e3\u003c\/span\u003e\n\u003cdiv\u003eCalibrate the second point in a decanted sample of this pH Buffer 4.0.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px; padding: 12px 0; font-size: 0.93rem; line-height: 1.6;\"\u003e\n\u003cspan style=\"background: #2e5e2e; color: #fff; font-weight: bold; font-size: 0.85rem; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px;\"\u003e4\u003c\/span\u003e\n\u003cdiv\u003eDiscard the used buffer, rinse the probe and return it to storage solution. Recalibrate on your meter's schedule or whenever readings drift.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 1.1rem; font-weight: bold; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003ePairs Well With\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 2rem;\"\u003e\n\u003ca href=\"\/products\/flairform-ph-buffer-7\" style=\"text-decoration: none; color: inherit; background: #f4f9f4; border: 1px solid #c8dfc8; padding: 1rem; border-radius: 6px; display: block;\"\u003e\u003cstrong style=\"color: #2e5e2e; display: block; margin-bottom: 0.3rem;\"\u003eFlairform pH Buffer 7.0\u003c\/strong\u003e\n\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eThe other half of the 2-point calibration — always calibrate 7.0 first, then 4.0.\u003c\/p\u003e\n\u003c\/a\u003e\u003ca href=\"\/products\/flairform-electrode-cleaner\" style=\"text-decoration: none; color: inherit; background: #f4f9f4; border: 1px solid #c8dfc8; padding: 1rem; border-radius: 6px; display: block;\"\u003e\u003cstrong style=\"color: #2e5e2e; display: block; margin-bottom: 0.3rem;\"\u003eFlairform Electrode Cleaner\u003c\/strong\u003e\n\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eClean before you calibrate — a fouled probe upsets the slope either side of the buffer values.\u003c\/p\u003e\n\u003c\/a\u003e\u003ca href=\"\/collections\/ph-control-calibration-ph-ec\" style=\"text-decoration: none; color: inherit; background: #f4f9f4; border: 1px solid #c8dfc8; padding: 1rem; border-radius: 6px; display: block;\"\u003e\u003cstrong style=\"color: #2e5e2e; display: block; margin-bottom: 0.3rem;\"\u003epH Control \u0026amp; Calibration\u003c\/strong\u003e\n\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eStorage solutions, standards and pH adjusters — the full accuracy toolkit.\u003c\/p\u003e\n\u003c\/a\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 1.1rem; font-weight: bold; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eDo I need both pH Buffer 4.0 and 7.0?\u003c\/summary\u003e\n\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. It is essential to calibrate with at least two buffers differing by three or more pH units. Two-point calibration confirms the correct slope — that both the electrode and meter are ranging correctly. For nutrient solutions, 4.0 and 7.0 are the ideal pair.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eMy meter says calibrating with 7.0 only is fine — is it?\u003c\/summary\u003e\n\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo, not by professional standards. Some manufacturers claim single-point 7.0 calibration is enough, but professional practice stipulates two buffers because one point can't verify the slope. A meter that reads 7.0 correctly can still be wrong at 5.8 — exactly where your nutrient solution sits.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eWhich buffer do I calibrate with first?\u003c\/summary\u003e\n\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003epH 7.0 first, then 4.0. The neutral point sets the offset, the second point sets the slope. Rinse the probe between buffers so you don't carry one into the other.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eCan I store my pH probe in this buffer between uses?\u003c\/summary\u003e\n\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. pH buffers are not suitable for storing pH electrodes — they can upset electrode calibration. Use a dedicated storage solution like Flairform pH Electrode Storage instead.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eIs this buffer hazardous?\u003c\/summary\u003e\n\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. Per the safety data sheet it is non-hazardous, non-corrosive and a non-dangerous good — a dilute potassium hydrogen phthalate solution requiring no PPE in normal use. Keep it out of waterways, as it promotes algae growth.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"background: #1c3a1c; color: #fff; padding: 2rem; border-radius: 10px; text-align: center; margin-top: 2rem;\"\u003e\n\u003ch2 style=\"color: #fff !important; margin: 0 0 0.5rem; font-size: 1.3rem;\"\u003eOne Buffer Can't Confirm the Slope\u003c\/h2\u003e\n\u003cp style=\"color: #aed1ae !important; margin: 0 0 1.5rem; font-size: 0.95rem;\"\u003eCalibrate 2-point like the labs do. Free shipping over $499*.\u003c\/p\u003e\n\u003cdiv style=\"margin: 0 0 1.5rem;\"\u003e\n\u003cp style=\"font-size: 0.95rem; font-weight: bold; margin-bottom: 0.75rem; color: #fff;\"\u003eSelect Size\u003c\/p\u003e\n\u003cdiv style=\"display: flex; justify-content: center; gap: 0.75rem; flex-wrap: wrap;\"\u003e\n\u003cbutton data-variant-id=\"52071711473962\" class=\"tgg-size-btn-ff-ph4\" style=\"padding: 0.6rem 1.4rem; border: 2px solid #fff; border-radius: 6px; background: #fff; color: #1c3a1c; font-size: 0.95rem; font-weight: bold; cursor: pointer;\"\u003e250ml — $12.95\u003c\/button\u003e \u003cbutton data-variant-id=\"52071711506730\" class=\"tgg-size-btn-ff-ph4\" style=\"padding: 0.6rem 1.4rem; border: 2px solid #fff; border-radius: 6px; background: transparent; color: #fff; font-size: 0.95rem; font-weight: 600; cursor: pointer;\"\u003e1L — $24.95\u003c\/button\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap;\"\u003e\n\u003cbutton id=\"btn-add-to-cart\" style=\"background: #b67317 !important; color: #fff !important; padding: 0.85rem 2rem !important; border: none !important; border-radius: 6px !important; font-size: 1rem !important; font-weight: 700 !important; cursor: pointer !important;\"\u003eAdd to Cart\u003c\/button\u003e \u003ca href=\"\/collections\/ph-control-calibration-ph-ec\" style=\"background: transparent !important; color: #fff !important; padding: 0.85rem 2rem !important; border: 2px solid #fff !important; border-radius: 6px !important; font-size: 1rem !important; font-weight: 600 !important; text-decoration: none !important; display: inline-block !important;\"\u003eShop pH Control\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cscript\u003e\ndocument.addEventListener('DOMContentLoaded', function() {\n  var btn = document.getElementById('btn-add-to-cart');\n  if (!btn) return;\n\n  var selectedVariantId = '52071711473962';\n\n  var sizeBtns = document.querySelectorAll('.tgg-size-btn-ff-ph4');\n  sizeBtns.forEach(function(b) {\n    b.addEventListener('click', function() {\n      selectedVariantId = this.getAttribute('data-variant-id');\n      sizeBtns.forEach(function(ob) {\n        ob.style.background = 'transparent';\n        ob.style.color = '#fff';\n        ob.style.fontWeight = '600';\n      });\n      this.style.background = '#fff';\n      this.style.color = '#1c3a1c';\n      this.style.fontWeight = '700';\n    });\n  });\n\n  btn.addEventListener('click', function() {\n    fetch('\/cart\/add.js', {\n      method: 'POST',\n      headers: {'Content-Type': 'application\/json'},\n      body: JSON.stringify({id: parseInt(selectedVariantId, 10), quantity: 1})\n    }).then(function(response) {\n      return response.json();\n    }).then(function(data) {\n      if (data.status \u0026\u0026 data.status !== 200) { throw new Error(data.description); }\n      btn.textContent = 'Added to Cart';\n      btn.style.background = '#2e5e2e';\n      setTimeout(function() {\n        btn.textContent = 'Add to Cart';\n        btn.style.background = '#b67317';\n      }, 2000);\n    }).catch(function() {\n      btn.textContent = 'Error — Try Again';\n      btn.style.background = '#c0392b';\n      setTimeout(function() {\n        btn.textContent = 'Add to Cart';\n        btn.style.background = '#b67317';\n      }, 2500);\n    });\n  });\n});\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Flairform","offers":[{"title":"250ml","offer_id":52071711473962,"sku":"FF-MTR-PH4-250","price":12.95,"currency_code":"AUD","in_stock":true},{"title":"1L","offer_id":52071711506730,"sku":"FF-MTR-PH4-1L","price":24.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0847\/1573\/3290\/files\/7868-Ph-Buffer-4-250ml.png?v=1783918515","url":"https:\/\/www.thegrowguys.com.au\/products\/flairform-ph-buffer-4","provider":"The Grow Guys","version":"1.0","type":"link"}