{"product_id":"bluelab-ph-probeplus-replacement-probe-for-ph-penplus-australia","title":"Bluelab pH ProbePlus | Replacement Probe for pH PenPlus Australia","description":"\u003cdiv class=\"quick-answer-box\"\u003e\n\u003ch2 class=\"quick-answer-title\"\u003eQuick Answer\u003c\/h2\u003e\n\u003cul class=\"quick-answer-list\"\u003e\n\u003cli\u003eReplacement double-junction probe for the Bluelab pH PenPlus. Fits nothing else.\u003c\/li\u003e\n\u003cli\u003eScrews in by hand in under a minute, no tools, then recalibrate and you're going again.\u003c\/li\u003e\n\u003cli\u003eRoughly half the cost of a new pen, which is the whole point of the PenPlus.\u003c\/li\u003e\n\u003cli\u003eIP68 rated, supplied with a KCl-filled silicone storage cap.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eBluelab pH ProbePlus\u003c\/h2\u003e\n\u003cp\u003epH probes wear out. The glass membrane ages through normal use, and once it does, readings drift and calibration stops holding. It isn't a fault, it's the nature of the thing. With most pens that means buying another pen. With the \u003ca href=\"\/products\/ph-temperature-pen-digital-hydroponic-tester-australia\"\u003epH PenPlus\u003c\/a\u003e it means fitting one of these.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace the Probe\u003c\/h2\u003e\n\u003cp\u003eA probe usually gives 12 to 18 months, though that varies a lot with how often it's used and whether it's been stored wet. The signs are consistent:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReadings drift between calibrations, so a pen calibrated this morning reads differently by the afternoon.\u003c\/li\u003e\n\u003cli\u003eCalibration takes several goes, or the pen refuses to accept it.\u003c\/li\u003e\n\u003cli\u003eResponse goes sluggish, taking much longer to settle on a number than it used to.\u003c\/li\u003e\n\u003cli\u003eReadings disagree with a second meter you trust.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWorth ruling out the cheap causes first. Old calibration solution and a dirty probe cause more bad readings than genuine probe failure. Our \u003ca href=\"\/products\/bluelab-probe-care-kit-ph-ec-hydroponics-australia\"\u003eProbe Care Kit\u003c\/a\u003e handles cleaning, and the \u003ca href=\"\/blogs\/resources\/ph-meter-inconsistent-readings-calibration-guide-australia\"\u003einconsistent readings guide\u003c\/a\u003e works through the whole checklist.\u003c\/p\u003e\n\n\u003ch2\u003eFitting It\u003c\/h2\u003e\n\u003cp\u003eUnscrew the old probe, screw the new one in, calibrate. It takes about a minute and needs no tools. Calibrate straight after fitting, because a new probe won't match the calibration the old one was carrying.\u003c\/p\u003e\n\u003cp\u003eKeep the KCl-filled cap on whenever the pen isn't in use. The internal sponge holds moisture against the probe, and a probe that dries out is permanently damaged rather than just needing a recalibration. That single habit does more for probe life than anything else.\u003c\/p\u003e\n\n\u003ch2\u003eWorth Keeping a Spare\u003c\/h2\u003e\n\u003cp\u003eA drifting pen mid-grow is worse than no pen, because you're making feed decisions on numbers you can't trust. Having a probe on the shelf turns that into a two-minute fix instead of a week waiting on delivery.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits.\u003c\/strong\u003e Bluelab pH PenPlus only. Not compatible with the older pH Pen, Combo Meter or Guardian Monitor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Type.\u003c\/strong\u003e Double-junction pH, gel filled, non-refillable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasures.\u003c\/strong\u003e pH and temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting.\u003c\/strong\u003e Screw-cap, hand tightened, no tools\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIngress Rating.\u003c\/strong\u003e IP68\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplied With.\u003c\/strong\u003e KCl-filled silicone cap with internal sponge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical Service Life.\u003c\/strong\u003e 12 to 18 months with proper care\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration.\u003c\/strong\u003e Required immediately after fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWill this fit my Bluelab pH Pen?\u003c\/h3\u003e\n\u003cp\u003eOnly if it's the PenPlus. The older Bluelab pH Pen has a sealed, non-replaceable probe, so this won't fit it. It also doesn't suit the Combo Meter or Guardian Monitor, which use a different probe with a 2m cable.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I know whether the probe is worn out or just needs cleaning?\u003c\/h3\u003e\n\u003cp\u003eClean it and recalibrate with fresh solution first. If it holds calibration afterwards, the probe was dirty rather than finished. If it still drifts or won't calibrate cleanly, the membrane has aged and it's time for a new one.\u003c\/p\u003e\n\n\u003ch3\u003eDo I need to calibrate after fitting a new probe?\u003c\/h3\u003e\n\u003cp\u003eYes, straight away. The pen stores calibration values from the old probe and those don't carry across. Calibrate at pH 4.0 and 7.0 with fresh solution before taking any readings you intend to act on.\u003c\/p\u003e\n\n\u003ch3\u003eHow long will the new probe last?\u003c\/h3\u003e\n\u003cp\u003eGenerally 12 to 18 months. The biggest factor is storage. Kept capped and wet between uses, a probe lasts well. Left to dry out even once, it can be finished.\u003c\/p\u003e\n\n\u003ch3\u003eCan I extend the life of the probe?\u003c\/h3\u003e\n\u003cp\u003eStore it wet with the cap on, rinse with clean water after each use, and clean it monthly with a proper probe cleaner rather than wiping it with a cloth. Calibrate with fresh solution rather than a sachet that's been open for weeks.\u003c\/p\u003e\n\n\u003ch3\u003eDoes this qualify for free shipping?\u003c\/h3\u003e\n\u003cp\u003eNot on its own. Free shipping starts at $150 for orders under 3kg to VIC, NSW, QLD, SA and ACT. Adding calibration solution or a Probe Care Kit will usually get you there, and both are worth having alongside a new probe anyway.\u003c\/p\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":43833912361023,"sku":"BLPHPROBEPLUS","price":99.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/6898\/8479\/files\/BLUELAB_REPLACEMENT_PROBE_PH.webp?v=1788693828","url":"https:\/\/apexgrow.com.au\/products\/bluelab-ph-probeplus-replacement-probe-for-ph-penplus-australia","provider":"Apex Grow","version":"1.0","type":"link"}