{"product_id":"bluelab-ph-penplus","title":"pH PenPlus by Bluelab — Replaceable Probe pH \u0026 Temperature Meter","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 PenPlus is a handheld pH and temperature meter with a replaceable probe — when the probe wears out, you screw in a new Bluelab pH ProbePlus instead of binning the whole pen. Built in New Zealand to IP68 waterproof standards with a double-junction probe, backlit display and simple 2-point calibration, it's the long-service upgrade to the classic Bluelab pH Pen that growers have trusted for over a decade.\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;\"\u003eReplaceable Probe\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eScrew-cap design lets you swap in a fresh pH ProbePlus when natural probe wear occurs — restore performance without replacing the pen.\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 Accuracy\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eDouble-junction probe resists contamination from nutrient-heavy solutions for reliable ±0.1 pH readings, feed after feed.\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;\"\u003eIP68 Waterproof\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eFully dustproof and waterproof — built for wet grow rooms, reservoirs and greenhouse work, not just the odd splash.\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;\"\u003eCalibration Made Easy\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eSimple 2-point calibration with a built-in 30-day reminder, plus pH 4.0, pH 7.0 and KCl storage sachets in the box.\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\u003epH Range:\u003c\/strong\u003e 0.0 – 14.0 pH\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.1 pH at 25°C\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 0.1 pH \/ 1°C\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e 0 – 50°C (°C or °F display, ATC)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eProbe:\u003c\/strong\u003e Replaceable double-junction pH\/temp (Bluelab pH ProbePlus)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWaterproof Rating:\u003c\/strong\u003e IP68 dustproof and waterproof\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e Backlit with hold-reading function\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCalibration:\u003c\/strong\u003e 2-point (pH 7.0 + 4.0 or 10.0) with 30-day reminder\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 1 x AAA alkaline battery, approx. 350 hours, auto-off\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2 years pen \/ 6 months probe\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMade In:\u003c\/strong\u003e New Zealand\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eIn the Box:\u003c\/strong\u003e Pen, pH 4.0 \u0026amp; 7.0 calibration sachets, KCl storage solution, lanyard\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 — Hydrate Before Anything Else\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 glass bulb must be hydrated in KCl storage solution for 24 hours before first calibration. A dehydrated probe drifts, reads stuck near pH 7 and can be permanently damaged — this is the single most skipped step with pH pens.\u003c\/li\u003e\n\u003cli\u003eNever soak or store the probe in RO, distilled or deionised water — pure water changes the reference chemistry and kills the probe. KCl only.\u003c\/li\u003e\n\u003cli\u003eKeep a spare pH ProbePlus on the shelf and hydrate it 24 hours before swapping — Bluelab's own tip for zero downtime mid-crop.\u003c\/li\u003e\n\u003cli\u003eCalibrate monthly with fresh pH 7.0 and 4.0 solution — the pen's 30-day reminder tracks it for you.\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 Use — First Use Setup\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\u003e\u003cstrong\u003eHydrate for 24 hours.\u003c\/strong\u003e Remove the storage cap and place the probe tip in the KCl solution sachet, or stand the pen upright in a small container with enough KCl storage solution to submerge the tip. Leave for at least 24 hours — this conditions the glass bulb so the probe can calibrate correctly. Never use RO, distilled or deionised water.\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\u003e\u003cstrong\u003eRinse.\u003c\/strong\u003e After hydration, rinse the probe tip in fresh tap water and gently shake off the excess.\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\u003e\u003cstrong\u003eCalibrate — always pH 7.0 first.\u003c\/strong\u003e Place the tip in the pH 7.0 sachet, hold CAL until the display confirms, rinse, then repeat in pH 4.0 (or pH 10.0 if you mostly measure above 7). Both points are required — the pen won't hold a calibration done to 7.0 alone.\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;\"\u003e4\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMeasure.\u003c\/strong\u003e Dip the probe at least 2cm into your nutrient solution, reservoir or runoff and wait for the reading to stabilise. Short-press the power button to hold a reading.\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;\"\u003e5\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStore wet.\u003c\/strong\u003e Rinse the probe in fresh tap water after every use and refit the storage cap. Add 3–5 drops of KCl solution to the sponge inside the cap once a week so the probe never dries out.\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\/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; pH Control\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eFresh calibration solution and pH adjusters keep your readings accurate and your solution in range.\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;\"\u003eEC \u0026amp; Nutrient Meters\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003ePair with a conductivity pen to measure nutrient strength alongside pH for the full feeding picture.\u003c\/p\u003e\u003c\/a\u003e\n\u003ca href=\"\/collections\/bluelab-1\" 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;\"\u003eMore From Bluelab\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eProbes, monitors and meters from the New Zealand brand growers have relied on for over 30 years.\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;\"\u003eFAQ\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;\"\u003eDo I need to soak the probe before first use?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. Hydrate the probe tip in KCl storage solution for at least 24 hours before calibrating. Skipping this leaves the glass bulb dehydrated — readings drift, sit stuck near pH 7 and the probe can be permanently damaged. Never hydrate in RO, distilled or deionised water.\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;\"\u003eIs the probe on the pH PenPlus replaceable?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. The screw-cap probe design lets you swap in a new Bluelab pH ProbePlus when the original wears, so you replace the probe rather than the whole pen. Hydrate and calibrate every new probe before use.\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;\"\u003eIs the pH PenPlus waterproof?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. It carries an IP68 dustproof and waterproof rating, so it handles wet grow rooms, reservoirs and greenhouse conditions.\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 is the difference between the pH Pen and the pH PenPlus?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eThe PenPlus adds a replaceable double-junction probe, a 2-year pen warranty and IP68 construction. The standard pH Pen has a fixed probe — when it wears out, the whole pen is replaced.\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 measure temperature as well as pH?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. It reads solution temperature from 0–50°C with automatic temperature compensation and displays in Celsius or Fahrenheit alongside the pH reading.\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 calibration solution come included?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. It ships with pH 4.0 and pH 7.0 calibration sachets plus KCl storage solution, so you can hydrate, calibrate and start measuring without buying anything extra.\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;\"\u003eMeasure Once. Trust It.\u003c\/h2\u003e\n\u003cp style=\"color: #aed1ae !important; margin: 0 0 1.5rem; font-size: 0.95rem;\"\u003eBluelab accuracy with a probe you can replace — shipped fast Australia-wide from Tasmania.\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\/meters-pens-ph-ec-testing\" 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 Meters\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('52063970132266', 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":52063970132266,"sku":"BL-MTR-PHPEN-PLUS","price":184.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0847\/1573\/3290\/files\/Bluelab-PENPLUSPH-Product-Image-Front-Render-cmyk_flat.png?v=1783652630","url":"https:\/\/www.thegrowguys.com.au\/products\/bluelab-ph-penplus","provider":"The Grow Guys","version":"1.0","type":"link"}