{"product_id":"bluelab-soil-ph-pen","title":"Bluelab Soil pH Pen – Soil pH \u0026 Temperature Meter","description":"\u003ch2\u003eRead pH straight from the root zone, no slurry needed\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eBluelab Soil pH Pen\u003c\/strong\u003e measures \u003cstrong\u003epH and temperature directly in soil, coco coir, rockwool and potting mixes\u003c\/strong\u003e, and in nutrient solution too. Rather than mixing a soil slurry and waiting, you push the built-in \u003cstrong\u003estorage cap\/dibber\u003c\/strong\u003e into the medium to open a pathway, then slide the probe into the hole for a reading at the roots. A \u003cstrong\u003edouble-junction pH probe\u003c\/strong\u003e, \u003cstrong\u003eautomatic temperature compensation\u003c\/strong\u003e and a backlit display make it an everyday tool for containers, raised beds, polytunnels and grow tents alike.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect root-zone readings\u003c\/strong\u003e in soil, coco, rockwool, potting mix and solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated storage cap\/dibber\u003c\/strong\u003e makes a safe hole for the probe and keeps the tip wet in KCl solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e±0.1 pH accuracy\u003c\/strong\u003e with 0.1 pH resolution and automatic temperature compensation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-point calibration with a 30-day reminder\u003c\/strong\u003e – the tick disappears when it is due\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully waterproof\u003c\/strong\u003e, with hold function, auto-off and low-battery warning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbout 350 hours\u003c\/strong\u003e of use from one AAA battery\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNutrient Lockout Hiding in the Root Zone\u003c\/h3\u003e\u003cp\u003eIn soil and soilless media, pH decides which nutrients plants can actually take up. Too acidic and phosphorus becomes scarce while aluminium and manganese can build to toxic levels; too alkaline and phosphorus, zinc and boron are locked away. Either way you get \u003cstrong\u003epoor nutrient uptake\u003c\/strong\u003e, pale or stunted growth and deficiency symptoms even when the feed is right. Bluelab recommend \u003cstrong\u003epH 6.2–7.2 for soil crops\u003c\/strong\u003e and 5.5–6.3 in solution, though the ideal is plant specific. Testing the medium itself, rather than runoff alone, shows you what the roots are really sitting in.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBefore first use:\u003c\/strong\u003e check the tip is covered by KCl solution in the cap, then calibrate in pH 7.0 and pH 4.0 using the sachets supplied.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen a pathway:\u003c\/strong\u003e clear the top 5–10 cm of soil, push the cap\/dibber in up to the 'soil' mark and lift it out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure:\u003c\/strong\u003e twist to loosen and remove the cap, switch on and lower the probe into the hole with no sideways force; read once the value settles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry media:\u003c\/strong\u003e moisten with RO or distilled water and ideally wait 24 hours, as tap water shifts the reading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBeds and borders:\u003c\/strong\u003e test several spots and average the readings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRinse\u003c\/strong\u003e the tip in fresh tap water after every reading, clean it at least monthly and recalibrate after each clean.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasures:\u003c\/strong\u003e pH and temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e 0.0–14.0, resolution 0.1, accuracy ±0.1 at 25 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e 0–50 °C \/ 32–122 °F, resolution 1, accuracy ±1 °C \/ ±2 °F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e soil, coco coir, rockwool, potting mixes and nutrient solution (0.2 EC and above)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating environment:\u003c\/strong\u003e 0–50 °C; do not use or store outside this range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature compensation:\u003c\/strong\u003e automatic (ATC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration:\u003c\/strong\u003e two-point, pH 7.0 and 4.0 (or 7.0 and 10.0), 30-day reminder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e backlit LCD with hold function; auto-off after 4 minutes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe:\u003c\/strong\u003e double-junction pH probe with integrated storage cap\/dibber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 1 x AAA alkaline battery, about 350 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn the box:\u003c\/strong\u003e Soil pH Pen, pH 7.0 and pH 4.0 calibration sachets, KCl storage solution sachet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1 year\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluelab part code:\u003c\/strong\u003e PENSOILPH\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cdiv class=\"hcs-faq\"\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eHow is it different from the Bluelab Multimedia pH Meter?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThe Soil pH Pen is a one-piece pen with the probe built in and a dibber cap to open the hole. The Multimedia pH Meter pairs a handheld meter with Bluelab's separate spear-tip Leap pH probe on a cable.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan I push the probe straight into the soil?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. Always make the hole with the storage cap\/dibber first. The probe has a glass bulb that breaks if it is forced into soil or knocked sideways.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan I use it in nutrient solution as well?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. It is fully waterproof and reads solutions of 0.2 EC and above, so the same pen checks your feed tank and your pots. Rinse the tip between the two.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDoes it measure EC or moisture?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo, it reads pH and temperature only. For conductivity and moisture in the same media, Bluelab make the Pulse Multimedia EC\/MC Meter.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003ch3\u003eWorks Well With\u003c\/h3\u003e\u003cdiv class=\"hcs-related\" style=\"display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 0;\"\u003e\n\u003ca href=\"\/products\/bluelab-ph-7-0-solution-sachets\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-ph-7-0-solution-sachets-1.png?v=1790169276\u0026amp;width=160\" alt=\"Bluelab pH 7.0 Solution Sachets\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eBluelab pH 7.0 Solution Sachets\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eFirst calibration point\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/bluelab-ph-4-0-solution-sachets\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-ph-4-0-solution-sachets-default-title-1.png?v=1790169273\u0026amp;width=160\" alt=\"Bluelab pH 4.0 Solution Sachets\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eBluelab pH 4.0 Solution Sachets\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eSecond calibration point\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/kcl-ph-probe-storage-solution\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/kcl-ph-probe-storage-solution.jpg?v=1787262443\u0026amp;width=160\" alt=\"Growth Technology KCL Storage Solution\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eGrowth Technology KCL Storage Solution\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eKeeps the probe tip hydrated in the cap\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/bluelab-pulse-multimedia-ecmc-meter\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-pulse-multimedia-ecmc-meter-1.jpg?v=1790163817\u0026amp;width=160\" alt=\"Bluelab Pulse Multimedia EC\/MC Meter\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eBluelab Pulse Multimedia EC\/MC Meter\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eReads EC and moisture in the same media\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":53929890611466,"sku":"TLS-BLUE-020-01","price":153.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-soil-ph-pen-default-title-1.jpg?v=1792261686","url":"https:\/\/hydrocropshop.co.uk\/products\/bluelab-soil-ph-pen","provider":"Hydro Crop Shop","version":"1.0","type":"link"}