{"product_id":"bluelab-ph-7-0-calibration-solution-box-of-6","title":"Bluelab pH 7.0 Calibration Solution Box of 6 – pH 7 Buffer","description":"\u003ch2\u003eThe pH 7.0 reference every calibration starts from\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eBluelab pH 7.0 Calibration Solution\u003c\/strong\u003e is the neutral reference point for calibrating a pH pen, meter, monitor or controller probe. In a \u003cstrong\u003etwo-point pH calibration\u003c\/strong\u003e it always comes first: pH 7.0 sets the meter's zero point, and pH 4.0 (or pH 10.0) then sets the slope across the acidic or alkaline range. It suits every Bluelab pH product and any other meter that calibrates against a pH 7.0 buffer, and it is the solution to keep on the shelf if you look after several pens, monitors and controllers.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Bluelab pH 7.0 reference\u003c\/strong\u003e – the first point of every two-point calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick accuracy check\u003c\/strong\u003e – a clean probe should read 7.0 before you trust it with a feed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor every Bluelab pH product\u003c\/strong\u003e – pens, Combo Meter, OnePen, Guardian Monitor and controller probes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with other brands\u003c\/strong\u003e that calibrate at pH 7.0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects your nutrient uptake\u003c\/strong\u003e by keeping the readings you adjust to honest\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eIs Your pH Meter Telling the Truth?\u003c\/h3\u003e\u003cp\u003eA pH probe ages from the day it is first used: the glass bulb slows and the reference junction is gradually used up, so the reading drifts while the display still looks perfectly believable. A meter that reads half a point out has you adding pH down to a reservoir that was already right, or leaving one where iron and phosphorus start to lock out, and the result is \u003cstrong\u003epoor nutrient uptake\u003c\/strong\u003e, pale new growth and slower plants. Bluelab recommend cleaning and calibrating pH probes every 30 days, starting at pH 7.0 – and a calibration is only as good as the solution, so it must be fresh and uncontaminated every time.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean\u003c\/strong\u003e the probe and rinse it in fresh tap water before calibrating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePour\u003c\/strong\u003e a small amount of pH 7.0 into a clean container; never put the probe into the original container\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibrate at pH 7.0 first\u003c\/strong\u003e, rinse, then calibrate at pH 4.0 (or pH 10.0 if you mostly measure above 7)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiscard\u003c\/strong\u003e the used solution after calibrating; never pour it back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStore\u003c\/strong\u003e sealed, somewhere cool and out of direct sunlight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecalibrate\u003c\/strong\u003e every 30 days, after every clean, and whenever a reading looks wrong\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\u003eSolution:\u003c\/strong\u003e pH 7.0 calibration buffer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e first point of a two-point pH calibration; quick accuracy check\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with:\u003c\/strong\u003e all Bluelab pH pens, meters, monitors and controller probes; other pH meters that calibrate at pH 7.0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended interval:\u003c\/strong\u003e every 30 days and after cleaning (Bluelab)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e sealed, cool, out of direct sunlight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Bluelab\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;\"\u003eWhy calibrate at pH 7.0 first?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003epH 7.0 sets the meter's zero point. Bluelab's procedure always calibrates at 7.0 first, then at 4.0 (or 10.0) to set the slope.\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;\"\u003eDo I also need pH 4.0 solution?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eFor a full two-point calibration, yes. On its own, pH 7.0 is still useful as a quick check that a clean probe is reading true.\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 reuse the solution?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. Pour out only what you need, calibrate, then throw it away. Returning used solution or dipping the probe into the container contaminates what is left.\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-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;\"\u003eThe second calibration point\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/bluelab-2-77-ec-standard-solution-box-of-6\" 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-2-77-ec-standard-solution-box-of-6-250ml-x-6-1.jpg?v=1790229354\u0026amp;width=160\" alt=\"Bluelab 2.77 EC Standard Solution Box of 6\" 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 2.77 EC Standard Solution Box of 6\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eEC check solution for the same meters\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 probes wet between calibrations\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Bluelab","offers":[{"title":"250ml x 6","offer_id":53931117969674,"sku":"NUT-BLUE-015-01","price":51.9,"currency_code":"GBP","in_stock":true},{"title":"500ml x 6","offer_id":53931118002442,"sku":"NUT-BLUE-015-02","price":63.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-ph-7-0-calibration-solution-box-of-6-250ml-x-6-1.jpg?v=1792295910","url":"https:\/\/hydrocropshop.co.uk\/products\/bluelab-ph-7-0-calibration-solution-box-of-6","provider":"Hydro Crop Shop","version":"1.0","type":"link"}