{"product_id":"aqua-master-p50-pro-replacement-electrode","title":"P50 Pro Replacement Electrode by Aqua Master Tools — pH \u0026 Temperature Probe for the P50 Pro and P50 Pro2 Pens","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;\"\u003eA pH pen does not die all at once. The glass bulb slowly loses its response, readings start to drift, calibration takes longer to settle, and one day it will not hold a calibration at all. On most pens that means buying a new meter. On the Aqua Master Tools P50 Pro and P50 Pro2 it means unscrewing the sealing ring and fitting this genuine replacement electrode (part AMT1001). It is the same pH and temperature sensor the pen shipped with, it is IP67 waterproof once fitted, and the swap takes a couple of minutes without tools. It fits both generations of the P50 and nothing else in the Aqua Master range.\u003c\/p\u003e\n\n\u003cdiv style=\"background: #f4f9f4; border-left: 4px solid #2e5e2e; padding: 1rem 1.3rem; border-radius: 6px; margin-bottom: 2rem; font-size: 0.93rem; line-height: 1.6;\"\u003e\n\u003cstrong style=\"color: #2e5e2e;\"\u003eSoak it before you use it.\u003c\/strong\u003e Aqua Master ships this electrode dry, and dried salt around the glass is normal. Stand the new electrode in tap water for at least 12 hours before fitting it, then calibrate. Skip the soak and the first readings will wander.\u003c\/div\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 the P50 Pro and P50 Pro2\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eAqua Master makes one P50 electrode (AMT1001) and it fits both generations of the pen. If you own a P50, this is the part.\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;\"\u003eLess than half the price of a new pen\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eA worn bulb is the only part of a P50 that wears out. Replace the electrode and the meter body, display and batteries carry on as they were.\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;\"\u003eNo tools, no soldering\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eUnscrew the sealing ring at the base of the pen, pull the old electrode, seat the new one with the recess lined up, tighten the ring. Done.\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;\"\u003eIP67 once it is fitted\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eThe rubber seal and sealing ring restore the pen's full waterproof rating, so it still floats and still survives a dunk in the reservoir.\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;\"\u003epH and temperature in one sensor\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eThe temperature sensor lives in the electrode too, so automatic temperature compensation comes back with the new part.\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;\"\u003eGenuine part, six-month warranty\u003c\/strong\u003e\u003cspan style=\"font-size: 0.9rem; color: #444;\"\u003eAqua Master Tools warrants the electrode for six months. Third-party parts void the pen's warranty, so this is the only one worth fitting.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdetails style=\"margin-bottom: 2rem;\"\u003e\n\u003csummary style=\"cursor: pointer; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003e\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; margin: 0; display: inline;\"\u003eSpecifications\u003c\/h2\u003e\u003c\/summary\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem 2rem; font-size: 0.95rem;\"\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Aqua Master Tools\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e AMT1001\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e P50 Pro and P50 Pro2 pH \u0026amp; Temp pens\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMeasures:\u003c\/strong\u003e pH and temperature\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e Glass pH bulb with integrated temperature sensor\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWaterproof rating:\u003c\/strong\u003e IP67 when fitted to the pen\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFitting:\u003c\/strong\u003e Tool-free, via the pen's sealing ring\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBefore first use:\u003c\/strong\u003e Soak in tap water for 12 hours, then calibrate\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCalibration after fitting:\u003c\/strong\u003e 2-point auto, pH 7.00 then pH 4.01\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e Upright with KCl storage solution in the cap (Aqua Master's recommendation)\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 6 months on the electrode\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 8785258333705\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom: 2rem;\"\u003e\n\u003csummary style=\"cursor: pointer; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003e\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; margin: 0; display: inline;\"\u003eGrower's Tip\u003c\/h2\u003e\u003c\/summary\u003e\n\u003cdiv style=\"background: #fff8e1; border-left: 4px solid #f9a825; padding: 1rem 1.3rem; border-radius: 6px; margin-bottom: 0;\"\u003e\n\u003cul style=\"margin: 0 0 0 1.2rem; padding: 0; font-size: 0.93rem; line-height: 1.7;\"\u003e\n\u003cli\u003eBefore you buy, try a clean and recalibrate. A bulb coated in nutrient film reads slow and drifty exactly like a worn one. Ten minutes in electrode cleaner, a rinse, then fresh pH 7 and pH 4 buffers. If it calibrates and holds, you did not need a new electrode.\u003c\/li\u003e\n\u003cli\u003eSigns it really is worn: calibration fails or will not settle, readings drift while the pen sits in a stable buffer, the response time has blown out to a minute or more, or the glass is visibly cracked or chipped.\u003c\/li\u003e\n\u003cli\u003eUse fresh buffer solution for the first calibration on a new electrode. Old buffers that have been dipped a dozen times are contaminated and will calibrate the new sensor to a wrong number.\u003c\/li\u003e\n\u003cli\u003eNever store a pH electrode in distilled or RO water. It pulls the ions out of the glass and shortens its life. Tap water is fine for the pre-use soak; KCl storage solution in the cap is best for day to day.\u003c\/li\u003e\n\u003cli\u003eRinse the electrode with water after every reading and put the cap back on. Dried nutrient salts on the glass are the main reason pH electrodes wear out early.\u003c\/li\u003e\n\u003cli\u003eDo not plunge a cold electrode into hot liquid or the other way round. Sudden temperature swings can crack the glass bulb, and that is not covered by warranty.\u003c\/li\u003e\n\u003cli\u003eKeep the old electrode's rubber seal if the new one looks different. Aqua Master's instructions have you check the seal is seated before tightening, and a mis-seated seal is how water gets into the pen.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom: 2rem;\"\u003e\n\u003csummary style=\"cursor: pointer; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003e\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; margin: 0; display: inline;\"\u003eHow To Fit It\u003c\/h2\u003e\u003c\/summary\u003e\n\u003cdiv\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\u003eSoak the new electrode in tap water for at least 12 hours. This dissolves the dried salts and activates the glass. Do this before you touch the pen.\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\u003eTurn the pen off, take the cap off and unscrew the sealing ring at the lower end of the meter.\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\u003ePull the old electrode straight out. Gently. It is a push fit onto connector pins, not a thread.\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\u003eLine up the recess on the new electrode with the pen body and push it home so the connectors mate properly. Forcing it in the wrong way round damages the pins.\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;\"\u003e5\u003c\/span\u003e\u003cspan\u003eCheck the rubber seal is sitting flat, then screw the sealing ring back on tight. This is what gives you the IP67 rating back.\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;\"\u003e6\u003c\/span\u003e\u003cspan\u003eRun the pen's 2-point calibration in fresh pH 7.00 then pH 4.01 buffer, as described in the manual. The pen is ready once it confirms the calibration.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 1rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eWant to see it done first? \u003ca href=\"https:\/\/www.youtube.com\/watch?v=MR_Nq81lPM8\" target=\"_blank\" rel=\"noopener\" style=\"color: #2e5e2e; font-weight: 600;\"\u003eWatch Aqua Master Tools' electrode replacement video on YouTube\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom: 2rem;\"\u003e\n\u003csummary style=\"cursor: pointer; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003e\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; margin: 0; display: inline;\"\u003ePairs Well With\u003c\/h2\u003e\u003c\/summary\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem;\"\u003e\n\u003ca href=\"\/products\/aqua-master-tools-p50-pro2-ph-temperature-meter\" 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;\"\u003eAqua Master P50 Pro2 pH \u0026amp; Temperature Meter\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eThe pen this electrode fits. If the body or display has given up rather than the bulb, this is the fix instead.\u003c\/p\u003e\u003c\/a\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\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eFirst point of the P50's 2-point calibration. Fresh buffer for a fresh electrode.\u003c\/p\u003e\u003c\/a\u003e\n\u003ca href=\"\/products\/flairform-ph-buffer-4\" 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 4.0\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eSecond calibration point. You need both to calibrate the P50 properly.\u003c\/p\u003e\u003c\/a\u003e\n\u003ca href=\"\/products\/flairform-ph-electrode-storage\" 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 Electrode Storage Solution\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eA few drops in the cap keeps the glass hydrated between readings. Aqua Master recommends storing the P50 this way.\u003c\/p\u003e\u003c\/a\u003e\n\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\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eClean the bulb before you condemn it. Regular cleaning is what makes the next electrode last longer than the last one.\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 – pH \u0026amp; EC Testing\u003c\/strong\u003e\u003cp style=\"font-size: 0.85rem; margin: 0;\"\u003eEvery pH, EC and combo pen we stock, plus the probes and solutions that keep them honest.\u003c\/p\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"margin-bottom: 2rem;\"\u003e\n\u003csummary style=\"cursor: pointer; border-bottom: 2px solid #2e5e2e; padding-bottom: 0.4rem; margin-bottom: 1rem;\"\u003e\u003ch2 style=\"font-size: 1.1rem; font-weight: 700; margin: 0; display: inline;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\u003c\/summary\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 electrode fit the P50 Pro2 as well as the original P50 Pro?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes. Aqua Master Tools makes a single P50 electrode, part AMT1001, and lists it as the replacement for both the P50 Pro and the P50 Pro2. The Pro2 changed the display, batteries and firmware, not the electrode.\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;\"\u003eWill it fit the P110, P160 or E50 pens?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. Each Aqua Master pen family has its own electrode and they are not interchangeable. The P160 Pro and Pro2 use the P160 electrode (AMT1019), the P110 uses AMT1014 and the E50 uses the E50 EC electrode. Check the model name printed on your pen before ordering.\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;\"\u003eHow do I know the electrode is worn and not just dirty?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eClean it first. Soak the bulb in electrode cleaner, rinse, then calibrate in fresh pH 7 and pH 4 buffers. If the pen still will not calibrate, drifts while sitting in a stable buffer, or takes more than a minute to settle, the glass has had its day and this electrode is the fix.\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;\"\u003eDo I need any tools to replace it?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eNo. The sealing ring at the base of the pen unscrews by hand, the old electrode pulls straight out and the new one pushes in. Aqua Master's own instructions are seven steps and most of them are \"check the seal\" and \"calibrate\".\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 pen need recalibrating after I fit the new electrode?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes, every time. The calibration stored in the pen belongs to the old electrode. Soak the new one for 12 hours, fit it, then run the 2-point calibration in pH 7.00 and pH 4.01 before you trust a single 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;\"\u003eWhy does the new electrode have white crust on it?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eThat is dried salt from the electrode's internal solution and Aqua Master says it is normal. The 12-hour soak in tap water dissolves it and rehydrates the glass. It is not a fault and it is not a sign the part is old.\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 still waterproof with a replacement electrode?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eYes, provided the rubber seal is seated and the sealing ring is done up tight. Aqua Master rates the electrode IP67 when attached to the meter, the same as the pen out of the box.\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;\"\u003eHow long should a P50 electrode last?\u003c\/summary\u003e\u003cp style=\"margin: 0.6rem 0 0; font-size: 0.93rem; line-height: 1.6;\"\u003eIt depends on how it is treated, and Aqua Master does not publish a figure. Rinsed after every use, capped with storage solution and kept out of concentrated nutrients and pH adjusters, a pH electrode lasts a long time. Left dry on a bench with nutrient crust on the glass, it will not. The warranty on the electrode itself is six months.\u003c\/p\u003e\u003c\/details\u003e\n\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;\"\u003eFix the pen, keep the pen\u003c\/h2\u003e\n\u003cp style=\"color: #aed1ae !important; margin: 0 0 1.5rem; font-size: 0.95rem;\"\u003eGenuine Aqua Master Tools P50 electrode, shipped from Tasmania. 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 \u0026amp; Pens\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\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('53474205040938', 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","brand":"Aqua Master Tools","offers":[{"title":"Default Title","offer_id":53474205040938,"sku":"AMT-METER-ELEC-P50PRO","price":64.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0847\/1573\/3290\/files\/aqua-master-p50-pro-replacement-electrode-amt1001.jpg?v=1793914181","url":"https:\/\/www.thegrowguys.com.au\/products\/aqua-master-p50-pro-replacement-electrode","provider":"The Grow Guys","version":"1.0","type":"link"}