{"product_id":"aqua-master-tools-ph-calibration-solution","title":"Aqua Master Tools pH Calibration Solution","description":"\u003ch2\u003eKeeps every pH reading honest — calibrate before you dose, not after\u003c\/h2\u003e\u003cp\u003eA pH meter is only as accurate as its last calibration, and electrodes naturally drift out of true with regular use, so growers who skip calibration are effectively guessing at pH without realising it. This is a NIST-traceable pH buffer solution used to check and reset a meter or probe against a known, fixed reference point before feeding, available in the two standard buffer values — pH 4.01 and pH 7.00 — needed for a proper 2-point calibration.\u003c\/p\u003e\u003cp\u003eIt works with any pH meter or pen, not just the Aqua Master Tools range, making it a sensible bottle to keep on the shelf regardless of which brand of meter is in use. Running a 2-point calibration regularly, ideally before every reservoir mix or at minimum weekly, catches probe drift before it turns into an under or over-corrected feed — a meter reading half a point off pH can be the difference between a nutrient solution sitting comfortably in the uptake range and one that is quietly locking out phosphorus or micronutrients.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNIST-traceable buffer solution\u003c\/strong\u003e for accurate, repeatable calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable at pH 4.01 and pH 7.00\u003c\/strong\u003e — the two points needed for a full calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with any brand of pH meter or pen\u003c\/strong\u003e, not just Aqua Master Tools\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatches probe drift\u003c\/strong\u003e before it causes dosing errors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple top-up bottle\u003c\/strong\u003e to keep on the shelf by the reservoir\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\u003cul\u003e\n\u003cli\u003eBuffer values: pH 4.01, pH 7.00\u003c\/li\u003e\n\u003cli\u003eStandard: NIST-traceable\u003c\/li\u003e\n\u003cli\u003eStorage: 15-25°C, reseal immediately after use\u003c\/li\u003e\n\u003cli\u003eNote: do not return used liquid to the bottle\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"Aqua Master Tools","offers":[{"title":"pH 4.01 (100ml)","offer_id":53500712026378,"sku":"AMT-PHCAL-401-100ML","price":4.95,"currency_code":"GBP","in_stock":true},{"title":"pH 7.00 (100ml)","offer_id":53500712059146,"sku":"AMT-PHCAL-700-100ML","price":4.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/aquamastertools_phbuffer_4_1.jpg?v=1786377503","url":"https:\/\/hydrocropshop.co.uk\/products\/aqua-master-tools-ph-calibration-solution","provider":"Hydro Crop Shop","version":"1.0","type":"link"}