{"product_id":"hy-gen-ph-calibration-solution","title":"HY-GEN pH Calibration Solution","description":"\u003cp\u003eA pH meter is only as good as its last calibration. HY-GEN pH Calibration Solution gives an electronic meter the two reference points it needs for a two-point calibration: pH Buffer 4 for the low end and pH Buffer 7 for the high end. Calibrate against both and your meter reads with accuracy and precision between pH 4 and 7. That's the part of the scale that matters when you're feeding plants.\u003c\/p\u003e\u003cp\u003eWhy does a meter need this at all? The glass bulb in a pH probe produces a tiny voltage that changes with the acidity of the liquid around it. That response shifts as the probe ages, dries out or picks up residue, and the meter has no way of knowing it has happened. A buffer holds a known, stable pH. With the probe sitting in it, the meter learns what that voltage should mean. Give it two buffers and it learns two things: where the reading should sit, and how steeply it should change from one point to the next. A two-point calibration gives a truer picture across the whole working range than a single point can.\u003c\/p\u003e\u003cp\u003eHY-GEN make both buffers from high quality analytical grade constituents and leave out artificial dyes completely. That's why the solutions are clear. The brand's view is that a calibration solution should hold only the purest ingredients, and HY-GEN say their calibration solutions are made according to international standards.\u003c\/p\u003e\u003cp\u003eGetting the meter right matters because pH controls what the roots can actually take up. HY-GEN point out that when a nutrient solution's pH runs too high or too low, some nutrients are more likely to become unavailable to the plant. pH also moves as plants grow and their demand for nutrients climbs. A meter that has drifted can send you chasing a problem that isn't there, or let a real one slip past. HY-GEN suggest pH 6.3 works well for most plants, though the right figure varies from plant to plant.\u003c\/p\u003e","brand":"HY-GEN","offers":[{"title":"250 ml \/ 4.0","offer_id":67551782666398,"sku":"9334851000690","price":8.99,"currency_code":"AUD","in_stock":false},{"title":"250 ml \/ 7.0","offer_id":67551782699166,"sku":"9334851000645","price":8.99,"currency_code":"AUD","in_stock":true},{"title":"1 L \/ 4.0","offer_id":67551782731934,"sku":"9334851000713","price":22.49,"currency_code":"AUD","in_stock":false},{"title":"1 L \/ 7.0","offer_id":67551782764702,"sku":"9334851000669","price":22.49,"currency_code":"AUD","in_stock":false},{"title":"5 L \/ 4.0","offer_id":67551782797470,"sku":"PLACEHOLDER920004","price":98.99,"currency_code":"AUD","in_stock":false},{"title":"5 L \/ 7.0","offer_id":67551782830238,"sku":"PLACEHOLDER920006","price":98.99,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0709\/5261\/6094\/files\/HY-GEN_pH_Calibration_Solution.png?v=1793790167","url":"https:\/\/www.hydrooasis.com.au\/products\/hy-gen-ph-calibration-solution","provider":"Hydro Oasis","version":"1.0","type":"link"}