{"product_id":"bluelab-conductivity-pen","title":"Conductivity Pen by Bluelab — Fast, Accurate EC, PPM \u0026 Temperature Testing","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 Conductivity Pen tells you exactly how strong your nutrient solution is, in seconds. Dip it in your reservoir and it reads EC, ppm 500 (TDS) or ppm 700 plus solution temperature on a backlit display — so you know whether to feed harder or back off before your plants tell you the hard way. It's factory calibrated, fully waterproof, and built by Bluelab in New Zealand for grow rooms, not laboratories.\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;\"\u003eReady Out of the Box\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eFactory calibrated with the AAA battery included. Turn it on and start reading — calibration is optional, not required.\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;\"\u003eReads the Scales You Use\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eSwitch between EC, ppm 500 (TDS) and ppm 700 to match whatever scale your nutrient chart is written in.\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;\"\u003eTemperature Compensated\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eAutomatic Temperature Compensation (ATC) corrects the reading for solution temperature, so it's accurate in a cold shed or a warm tent.\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;\"\u003eFully Waterproof\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eNot just splash resistant — drop it in the reservoir and it survives. Hold function freezes the reading so you don't lose it.\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\u003e0.0–10.0 EC \/ 0–5000 ppm (500) \/ 0–7000 ppm (700)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eTemperature range\u003c\/strong\u003e\u003cbr\u003e0–50°C \/ 32–122°F\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAccuracy at 25°C\u003c\/strong\u003e\u003cbr\u003e±0.1 EC \/ ±50 ppm (500) \/ ±70 ppm (700), ±1°C\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eResolution\u003c\/strong\u003e\u003cbr\u003e0.1 EC \/ 10 ppm, 1°C\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eTemperature compensation\u003c\/strong\u003e\u003cbr\u003eAutomatic (ATC)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCalibration\u003c\/strong\u003e\u003cbr\u003eFactory calibrated — manual calibration optional\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eUnits\u003c\/strong\u003e\u003cbr\u003eEC, ppm 500, ppm 700, °C, °F\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003cbr\u003eBacklit LCD with low battery indicator\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003ePower\u003c\/strong\u003e\u003cbr\u003e1 x AAA alkaline (included) — approx. 350 hours\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eOther\u003c\/strong\u003e\u003cbr\u003eFully waterproof, auto off, hold reading function\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003e1-year 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 — Keep the Probe Clean\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 pen is only as accurate as the probe is clean. Rinse it under running tap water after every use to stop nutrient salts building up.\u003c\/li\u003e\n\u003cli\u003eEvery two weeks, clean the probe face with a drop of Bluelab Conductivity Probe Cleaner or an unscented cream cleanser like Jif — never scented varieties, the oils contaminate the probe.\u003c\/li\u003e\n\u003cli\u003eLow readings almost always mean a dirty probe, not a faulty pen. Clean it and retest before assuming anything's wrong.\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 It\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\u003ePress the power button to turn the pen on. It recalls your last measurement for 3 seconds, then it's ready to read.\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\u003ePlace the probe in your nutrient solution and wait for the reading to stabilise.\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\u003eShort press the power button to hold the reading on screen if you need to note it down. To change units, hold the units button for 3 seconds and cycle through EC, ppm 500 and ppm 700.\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\u003eRinse the probe under running water after each use, and give it a proper clean every two weeks. If you choose to calibrate, always clean the probe first, then use Bluelab 2.77 EC standard solution.\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\/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;\"\u003eBluelab pH PenPlus\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eEC tells you how much food is in the water — pH tells you whether the plant can eat it. Run both for the full picture.\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; Probe Care\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003e2.77 EC standard solution and probe cleaner keep your readings honest for years.\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;\"\u003ePumps, reservoirs and dosing gear to act on what the pen tells you.\u003c\/p\u003e\u003c\/a\u003e\n\u003ca href=\"\/collections\/hydroponic-nutrients\" 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;\"\u003eNutrients\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eBase nutrients and additives — measured feeds beat guesswork every time.\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 the Bluelab Conductivity Pen need calibrating before first use?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. It's factory calibrated and ready to use out of the box. Manual calibration is optional — if you want to check it, clean the probe first, then calibrate in Bluelab 2.77 EC standard solution.\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 pH?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. This pen measures conductivity (EC\/ppm) and temperature only. For pH, pair it with the Bluelab pH PenPlus — the two together cover everything you need to know about your nutrient solution.\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 pen waterproof?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes, fully waterproof — provided the battery cap is fastened down with no gap between cap and body. It will survive a dunk in the reservoir.\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 read the 540 ppm scale?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. It reads EC, ppm 500 (TDS) and ppm 700. If your feed chart uses the 540 scale, set the pen to EC and multiply the reading by 540 to convert.\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 pen reading low?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eLow readings usually mean the probe is contaminated with nutrient salt build-up, not that the pen is faulty. Clean the probe face with Bluelab Conductivity Probe Cleaner or an unscented cream cleanser, rinse, and retest in a known solution.\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 battery does it take?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eOne AAA alkaline battery, included, with around 350 hours of life. Don't use rechargeables — Bluelab specifies alkaline only.\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;\"\u003eStop Guessing Your Nutrient Strength\u003c\/h2\u003e\n\u003cp style=\"color: #aed1ae !important; margin: 0 0 1.5rem; font-size: 0.95rem;\"\u003eBluelab accuracy, backed by a 1-year warranty. 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\/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('52066895528234', 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":52066895528234,"sku":"BL-MTR-ECPEN","price":159.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0847\/1573\/3290\/files\/BL_Image-Product_Front-PNG_PENCON_44ae00d4-f9c4-4ae5-af5d-979572d7769f.png?v=1783735834","url":"https:\/\/www.thegrowguys.com.au\/products\/bluelab-conductivity-pen","provider":"The Grow Guys","version":"1.0","type":"link"}