{"product_id":"bluelab-ph-probe-2m","title":"pH Probe by Bluelab — 2m BNC Replacement Probe for Bluelab Meters, Monitors \u0026 Controllers","description":"\u003cdiv style=\"font-family: 'Helvetica Neue', Arial, sans-serif; max-width: 860px; margin: 0 auto; color: #1a1a1a;\"\u003e\n\n\u003cp style=\"font-size: 1.05rem; line-height: 1.7; margin-bottom: 1.5rem;\"\u003eThe Bluelab pH Probe is the standard 2-metre BNC replacement probe for Bluelab meters, monitors and controllers. When your Guardian or pH Controller starts drifting and cleaning won't bring it back, this is the part you swap — a double-junction, gel-filled probe in a polycarbonate body, with the probe holder suction cup and a KCl-filled storage cap in the box. Connect it, calibrate it, and your readings are trustworthy again without replacing the whole unit.\u003c\/p\u003e\n\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;\"\u003eFits Any Bluelab BNC Device\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eStandard BNC connector — push on, quarter turn, done. Compatible with Bluelab handheld meters, monitors and controllers that take a BNC probe.\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;\"\u003eDouble-Junction Longevity\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eThe double-junction Ag\/AgCl reference resists contamination, so the probe stays accurate longer in dirty nutrient solutions.\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;\"\u003e2m Cable Reaches the Reservoir\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eTwo metres of cable with a waterproof joint puts the probe in the tank while the meter stays dry and readable.\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;\"\u003eMounting Sorted\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eProbe holder with suction cup included — fix it to the reservoir wall at the right depth and leave it there.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; 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\u003eMeasurement range\u003c\/strong\u003e\u003cbr\u003e0.0–14.0 pH\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAccuracy at 25°C\u003c\/strong\u003e\u003cbr\u003e±0.1 pH\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eReference\u003c\/strong\u003e\u003cbr\u003eDouble junction, Ag\/AgCl, saturated KCl gel (non-refillable)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eConnector\u003c\/strong\u003e\u003cbr\u003eStandard BNC, waterproof cable joint\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCable length\u003c\/strong\u003e\u003cbr\u003e2 metres \/ 6.5 feet\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBody\u003c\/strong\u003e\u003cbr\u003ePolycarbonate, waterproof probe\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eOperating environment\u003c\/strong\u003e\u003cbr\u003e0–60°C \/ 32–144°F\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eIncluded\u003c\/strong\u003e\u003cbr\u003eProbe holder with suction cup, KCl-filled storage cap\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003e6-month limited warranty\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMade by\u003c\/strong\u003e\u003cbr\u003eBluelab, New Zealand\u003c\/div\u003e\n\u003c\/div\u003e\n\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 — If It Dries, It Dies\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\u003eThe probe tip must stay wet at all times. When it's not in the reservoir, keep the storage cap on with enough Bluelab KCl storage solution to cover the tip. Never use RO, distilled or deionised water — pure water changes the reference chemistry and kills the probe.\u003c\/li\u003e\n\u003cli\u003eIf the tip has dried out or hasn't been stored in KCl, clean it, then stand it in a container of KCl solution submerging the tip for at least 24 hours, and calibrate afterwards.\u003c\/li\u003e\n\u003cli\u003eHandle it like the glass instrument it is: always loosen the storage cap before pulling it off, don't bend or knock the probe, don't kink the lead, and never let the BNC connector get wet.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003eHow to Install and Calibrate\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: 700; 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\u003cspan\u003eConnect the probe to your meter, monitor or controller: line up the lugs of the BNC fitting, push on, and twist a quarter turn to lock.\u003c\/span\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: 700; 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\u003cspan\u003eRemove the storage cap: grip the top, twist the base one rotation to loosen, then slide the cap off slowly. Keep the cap and its KCl solution — you'll need it every time the probe comes out of the reservoir.\u003c\/span\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: 700; 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\u003cspan\u003eCalibrate before first use — no cleaning needed the very first time. Always 2 points: pH 7.0 first, then 4.0 (or 10.0 if your readings normally sit above 7). Rinse the tip in clean water between solutions, and calibrate at the same temperature as the solution you'll be measuring.\u003c\/span\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: 700; 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\u003cspan\u003eRecalibrate monthly, and clean the probe first every time after that initial calibration. Also recalibrate whenever readings look off, after battery changes, or after the probe has been disconnected.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; 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=\"\/collections\/bluelab\" 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;\"\u003eBluelab Wi-Fi Guardian \u0026amp; pH Controller\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eThe devices this probe keeps honest — browse the full Bluelab range.\u003c\/p\u003e\u003c\/a\u003e\n\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;\"\u003eCalibration \u0026amp; KCl Solutions\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003epH 7.0 and 4.0 standards for monthly calibration, KCl storage solution to keep the tip alive.\u003c\/p\u003e\u003c\/a\u003e\n\u003ca href=\"\/collections\/meters-pens-ph-ec-testing\" 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;\"\u003eMeters \u0026amp; Pens\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eHandheld pH and EC testing for spot checks alongside your monitored reservoir.\u003c\/p\u003e\u003c\/a\u003e\n\u003ca href=\"\/collections\/water-control\" 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;\"\u003eWater Control\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003epH Up and Down, dosing gear and reservoir hardware to act on the readings.\u003c\/p\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; 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\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eDoes this probe fit the Bluelab Guardian and pH Controller?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. It's compatible with Bluelab handheld meters, monitors and controllers that use a standard BNC probe connection, including the Guardian Monitor, pH Controller and Combo Meter.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eDoes it fit the Bluelab pH Pen or pH PenPlus?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. The pens don't take a BNC probe — the pH Pen's probe is fixed, and the pH PenPlus uses its own screw-in pH ProbePlus, which we stock separately.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eDoes the probe need calibrating before use?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. Calibrate before first use (no cleaning required for that initial calibration) and then monthly — always 2-point, pH 7.0 first, then 4.0 or 10.0. Clean the probe before every calibration after the first.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eWhat warranty does it carry?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eThe Bluelab pH Probe carries a 6-month limited warranty with proof of purchase. pH probes are consumable glass instruments — they age with normal use, and lifespan depends heavily on storage and care.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eWhy is my probe drifting or stuck on one reading?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eDrift usually means a contaminated or dried-out tip — clean it, hydrate it in KCl storage solution for 24 hours, and recalibrate. A probe that reads the same in every buffer has broken glassware and needs replacing. If it reads pH 7 for everything, check the BNC fitting and cable for damage or moisture first.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 0.8rem; border: 1px solid #e0e0e0; border-radius: 6px; padding: 0.8rem 1rem;\"\u003e\u003csummary style=\"font-weight: 600; cursor: pointer;\"\u003eCan the BNC connector get wet?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. The probe and cable joint are waterproof, but the BNC connector at the meter end must stay dry — a wet fitting causes false readings and isn't covered under warranty.\u003c\/p\u003e\u003c\/details\u003e\n\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;\"\u003eBring Your Bluelab Back to Accurate\u003c\/h2\u003e\n\u003cp style=\"color: #aed1ae !important; margin: 0 0 1.5rem; font-size: 0.95rem;\"\u003eGenuine Bluelab replacement probe, holder and KCl cap included. Free shipping over $499*.\u003c\/p\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\n\u003ca href=\"\/collections\/bluelab\" 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 All Bluelab\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript\u003e\ndocument.addEventListener('DOMContentLoaded', function() {\n  var btn = document.getElementById('btn-add-to-cart');\n  if (!btn) return;\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('52067085812010', 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\n\u003c\/div\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":52067085812010,"sku":"BL-MTR-PROBE-PH-2M","price":129.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0847\/1573\/3290\/files\/BL_Image-Product_pH-Probe-new-logo-no-background_1.png?v=1783741653","url":"https:\/\/www.thegrowguys.com.au\/products\/bluelab-ph-probe-2m","provider":"The Grow Guys","version":"1.0","type":"link"}