{"product_id":"bluelab-onepen-ph-ec-temp-meter-bluetooth-connected","title":"Bluelab OnePen - 3-in-1 pH, EC \u0026 Temp Meter","description":"\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\u003ch2\u003eBluelab OnePen - 3-in-1 pH, EC \u0026amp; Temp Meter\u003c\/h2\u003e\u003cdiv\u003e\n\u003cp\u003eJuggling separate \u003ca href=\"\/products\/bluelab-ph-pen-compact-ph-temp-reader-floats\"\u003epH pens\u003c\/a\u003e and \u003ca href=\"\/products\/bluelab-conductivity-pen-ec-temp-reader-ready-to-use\"\u003econductivity pens\u003c\/a\u003e means double the calibration, double the probes to maintain, and readings that never line up in time. The Bluelab OnePen solves this with a single 3-in-1 probe that reads pH, conductivity (EC), and temperature simultaneously, giving growers one accurate snapshot of nutrient solution health instead of three separate checks.\u003c\/p\u003e\n\u003cp\u003eThe pen pairs a \u003ca href=\"\/products\/bluelab-onepen-replacement-probe-extend-pen-life\"\u003ereplaceable double-junction pH probe\u003c\/a\u003e with titanium EC electrodes, displaying pH and EC readings together on a bright backlit screen with 0.01 pH resolution. A built-in probe health indicator flags wear before it affects accuracy, and simple 2-point pH calibration using \u003ca href=\"\/products\/bluelab-ph-7-buffer-neutral-point-calibration\"\u003epH 7.0\u003c\/a\u003e and \u003ca href=\"\/products\/bluelab-ph-40-buffer-low-range-calibration\"\u003epH 4.0\u003c\/a\u003e buffers keeps results dependable over time. An IP68 rating protects the pen against dust and moisture in wet grow room and reservoir environments.\u003c\/p\u003e\n\u003cp\u003eConnect the OnePen to the \u003ca href=\"https:\/\/edenic.io\/\" rel=\"noopener noreferrer\" style=\"color: #2c5530;\" target=\"_blank\"\u003eEdenic app\u003c\/a\u003e over Bluetooth to view readings remotely, manage data, and keep the pen's software current. Conductivity readings are available in EC, mS\/cm, CF, ppm 500 (TDS), or ppm 700—similar to the scales used by the \u003ca href=\"\/products\/bluelab-truncheon-meter-ec-cf-ppm-no-calibration\"\u003eBluelab Truncheon Meter\u003c\/a\u003e—so the OnePen fits whichever nutrient program scale you already use. Plus, the \u003ca href=\"\/products\/bluelab-onepen-replacement-probe-extend-pen-life\"\u003ereplaceable probe\u003c\/a\u003e means a worn sensor doesn't mean buying a new pen.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv style=\"position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; margin: 20px 0; border-radius: 8px;\"\u003e\u003ciframe loading=\"lazy\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" src=\"https:\/\/www.youtube.com\/embed\/r_MxV1JXhB4?autoplay=1\u0026amp;mute=1\u0026amp;playsinline=1\u0026amp;loop=1\u0026amp;playlist=r_MxV1JXhB4\u0026amp;controls=0\u0026amp;rel=0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cstyle\u003e.features-grid-container{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;padding:2rem 0;font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;margin:0 auto;max-width:1240px;}.feature-card{background-color:transparent;padding:1.5rem;border-radius:8px;text-align:center;flex:0 1 240px;box-sizing:border-box;}\u003c\/style\u003e\u003cdiv class=\"features-grid-container\"\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e🔬\u003c\/span\u003e\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003e\u003ca href=\"\/products\/bluelab-onepen-replacement-probe-extend-pen-life\"\u003eReplaceable Dual-Sensor Probe\u003c\/a\u003e\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eDouble-junction pH probe and titanium EC electrodes swap out without replacing the pen.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e📟\u003c\/span\u003e\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003eSimultaneous pH \u0026amp; EC Display\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eBright backlit screen shows both readings at once, providing the same portable convenience as the \u003ca href=\"\/products\/bluelab-combo-meter-replaceable-ph-ec-probes-portable\"\u003eBluelab Combo Meter\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e🎯\u003c\/span\u003e\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003ePrecise 0.01 pH Resolution\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eFine-grained readings help you dial in nutrient solutions with confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e⚡\u003c\/span\u003e\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003eProbe Health Indicator\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eFlags probe wear early, so drifting readings don't catch you off guard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e💧\u003c\/span\u003e\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003eIP68 Waterproof \u0026amp; Dustproof\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eSealed construction holds up in wet reservoir and grow room conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e📶\u003c\/span\u003e\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003eBluetooth Connectivity\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003ePairs with the \u003ca href=\"https:\/\/edenic.io\/\" rel=\"noopener noreferrer\" style=\"color: #2c5530;\" target=\"_blank\"\u003eEdenic app\u003c\/a\u003e for remote readings and easy software updates.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003ch4\u003eWhat's Included\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBluelab OnePen with \u003ca href=\"\/products\/bluelab-onepen-replacement-probe-extend-pen-life\"\u003ereplaceable pH, Conductivity (EC), and Temperature probe\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eBluelab Sensor Cleaning Brush\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/bluelab-ph-7-buffer-neutral-point-calibration\"\u003eBluelab pH 7.0 Calibration Solution\u003c\/a\u003e (18ml \/ 0.6fl oz, single-use)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/bluelab-ph-40-buffer-low-range-calibration\"\u003eBluelab pH 4.0 Calibration Solution\u003c\/a\u003e (18ml \/ 0.6fl oz, single-use)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/bluelab-kcl-storage-solution-keep-probes-hydrated\"\u003eBluelab KCl Storage Solution\u003c\/a\u003e (18ml \/ 0.6fl oz)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4 style=\"margin-bottom: 0;\"\u003eSpecifications\u003c\/h4\u003e\u003cstyle\u003e.styled-spec-container{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid #eee;border-radius:8px;margin-bottom:1em;}.styled-spec-table{width:100%;border-collapse:collapse;}.styled-spec-table thead{background-color:#f8f8f8;}.styled-spec-table th,.styled-spec-table td{padding:12px 15px;text-align:left;vertical-align:top;}.styled-spec-table th{font-weight:bold;color:#333;border-bottom:2px solid #ccc;}.styled-spec-table td{border-bottom:1px solid #eee;}.styled-spec-table tbody td:first-child{font-weight:500;color:#444;}.styled-spec-table tbody tr:last-child td{border-bottom:none;}\u003c\/style\u003e\u003cdiv class=\"styled-spec-container\"\u003e\u003ctable class=\"styled-spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Range\u003c\/td\u003e\n\u003ctd\u003e0.0–14.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Resolution\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH Accuracy (at 25°C \/ 77°F)\u003c\/td\u003e\n\u003ctd\u003e±0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e32–122°F (0–50°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Resolution\u003c\/td\u003e\n\u003ctd\u003e0.1°C \/ 0.1°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Accuracy\u003c\/td\u003e\n\u003ctd\u003e±1°C \/ ±1°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductivity (EC) Range\u003c\/td\u003e\n\u003ctd\u003e0–10 mS\/cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductivity (EC) Resolution\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductivity (EC) Accuracy\u003c\/td\u003e\n\u003ctd\u003e±0.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCF Range\u003c\/td\u003e\n\u003ctd\u003e0–100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCF Resolution\u003c\/td\u003e\n\u003ctd\u003e0.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCF Accuracy\u003c\/td\u003e\n\u003ctd\u003e±1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTDS (ppm 500) Range\u003c\/td\u003e\n\u003ctd\u003e0–5,000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTDS (ppm 500) Resolution\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTDS (ppm 500) Accuracy\u003c\/td\u003e\n\u003ctd\u003e±50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eppm 700 Range\u003c\/td\u003e\n\u003ctd\u003e0–7,000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eppm 700 Resolution\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eppm 700 Accuracy\u003c\/td\u003e\n\u003ctd\u003e±70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Environment\u003c\/td\u003e\n\u003ctd\u003e32–122°F (0–50°C) — do not use or store outside this range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e2x AAA alkaline battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch4\u003eSupport \u0026amp; Manuals\u003c\/h4\u003e\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Bluelab_OnePen_Manual.pdf?v=1789576220\" rel=\"noopener noreferrer\" style=\"display: inline-flex; align-items: center; background-color: #f7f7f7; border: 1px solid #ddd; border-radius: 8px; padding: 12px 18px; text-decoration: none; color: #333; transition: background-color 0.3s ease, box-shadow 0.3s ease;\" target=\"_blank\"\u003e \u003cspan style=\"font-size: 1.5em; margin-right: 12px;\"\u003e📄\u003c\/span\u003e \u003cspan style=\"font-weight: bold;\"\u003eOnePen Manual\u003c\/span\u003e \u003c\/a\u003e\u003c\/div\u003e\u003ch4\u003eWarranty\u003c\/h4\u003e\u003cp\u003eThe Bluelab OnePen is covered by a 2-year limited warranty.\u003c\/p\u003e\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\u003cdiv class=\"faq-container\"\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eWhat does the Bluelab OnePen measure?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\u003cdiv\u003e\u003cp\u003eIt's a 3-in-1 handheld that reads pH, conductivity (EC), and temperature simultaneously on a single backlit display, giving you a full nutrient solution picture from one probe.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eCan the OnePen connect to my phone?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\u003cdiv\u003e\u003cp\u003eYes. It pairs over Bluetooth with the \u003ca href=\"https:\/\/edenic.io\/\" rel=\"noopener noreferrer\" style=\"color: #2c5530;\" target=\"_blank\"\u003eEdenic app\u003c\/a\u003e, letting you view readings remotely and keep the pen's software up to date.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eWhat conductivity scales does the OnePen support?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\u003cdiv\u003e\u003cp\u003eIt measures in EC, mS\/cm, CF, ppm 500 (TDS), and ppm 700, which can be verified for accuracy using a \u003ca href=\"\/products\/bluelab-277-ec-standard-solution-verify-ec-accuracy\"\u003e2.77 EC standard solution\u003c\/a\u003e.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eHow do I know when the probe needs attention?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\u003cdiv\u003e\u003cp\u003eA built-in probe health indicator flags when the probe needs cleaning or replacement, helping you catch problems before readings drift.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eIs the OnePen probe replaceable?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\u003cdiv\u003e\u003cp\u003eYes, the \u003ca href=\"\/products\/bluelab-onepen-replacement-probe-extend-pen-life\"\u003epH, EC, and temperature probe is replaceable\u003c\/a\u003e, so a worn probe doesn't mean replacing the entire pen.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eIs the Bluelab OnePen waterproof?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\u003cdiv\u003e\u003cp\u003eYes. It carries an IP68 rating for dust and water resistance, making it suitable for reservoir and grow room use.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":52473200935128,"sku":"PENONE","price":249.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Bluelab_OnePen_1.png?v=1789576874","url":"https:\/\/trimleaf.com\/products\/bluelab-onepen-ph-ec-temp-meter-bluetooth-connected","provider":"Trimleaf","version":"1.0","type":"link"}