{"product_id":"aqua-medic-ph-4-test-fluid-60ml","title":"Aqua Medic pH 4 Test Fluid 60ml","description":"\u003cp\u003e\u003cstrong\u003eA pH probe is only as accurate as its last calibration.\u003c\/strong\u003e This Aqua Medic pH 4 Test Fluid is a 60 mL bottle of pH 4.00 buffer solution, used to check and calibrate aquarium pH probes, handheld meters and controllers. Electrode accuracy drifts over time, so re-calibrating against a known buffer at regular intervals is what keeps a pH reading trustworthy rather than just plausible.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003epH 4.00 buffer solution\u003c\/strong\u003e — a known reference point for calibrating any pH probe or meter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mL bottle\u003c\/strong\u003e — enough for repeated calibrations before it runs out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePairs with pH 7 fluid for a two-point calibration\u003c\/strong\u003e — more accurate than calibrating against a single point, particularly if your tank's pH sits well away from 7.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBuffer value\u003c\/th\u003e\n\u003ctd\u003epH 4.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVolume\u003c\/th\u003e\n\u003ctd\u003e60 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eCalibration reference only — not for dosing into aquarium water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e calibrating any pH probe, handheld meter or controller, freshwater or marine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e adding to aquarium water — this is a calibration reference fluid, not a pH treatment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSetup and use\u003c\/h3\u003e\n\u003cp\u003eRinse the probe tip in clean water, then immerse it in the pH 4 fluid and give the reading time to settle before calibrating your meter or controller to 4.00, following that device's own calibration procedure. For a two-point calibration, repeat with a pH 7 fluid and calibrate the second point to 7.00. Rinse the probe again before returning it to the tank.\u003c\/p\u003e\n\n\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\n\u003cp\u003eKeep the bottle capped when not in use and away from direct sunlight and heat, and don't return used fluid to the bottle — decanting a small amount into a clean cup for each calibration keeps the rest of the bottle accurate for next time. Buffer solutions drift with age and contamination, so replace the bottle periodically rather than relying on one that's been open a long time.\u003c\/p\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/aqua-medic-ph-7-test-fluid-60ml\"\u003eAqua Medic pH 7 Test Fluid 60ml\u003c\/a\u003e — the second point for a two-point calibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/aqua-medic-kcl-solution-for-ph-mv-probes-60ml\"\u003eAqua Medic KCL Solution for pH \u0026amp; mV Probes 60ml\u003c\/a\u003e — storage solution to keep a probe tip hydrated between uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/aqua-medic-ph-probe-l127mm-plastic-standard\"\u003eAqua Medic pH Probe L127mm - Plastic Standard\u003c\/a\u003e — a replacement probe to calibrate against this fluid.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eCovered by Aqua Medic's manufacturer warranty against defects, in addition to your rights under Australian Consumer Law. Standard freight applies.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eDo I need both pH 4 and pH 7 fluid?\u003c\/h4\u003e\n\u003cp\u003eFor the most accurate calibration, yes — a two-point calibration against both buffers is more reliable than a single point, especially if your tank's pH runs well away from neutral.\u003c\/p\u003e\n\u003ch4\u003eHow often should I calibrate my pH probe?\u003c\/h4\u003e\n\u003cp\u003eAqua Medic doesn't publish a fixed interval, but as a general rule, probes drift over weeks to months rather than days — if your controller's reading doesn't match a manual test kit result, that's a sign it's time to calibrate.\u003c\/p\u003e\n\u003ch4\u003eCan I reuse the fluid I've already dipped the probe in?\u003c\/h4\u003e\n\u003cp\u003eNo — decant a small amount for each calibration and discard it afterwards rather than dipping the probe back into the main bottle, or you risk contaminating the rest of the fluid.\u003c\/p\u003e","brand":"Aqua Medic","offers":[{"title":"Default Title","offer_id":55285031993635,"sku":"AM230004","price":35.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/aqua-medic-ph-4-test-fluid-6-43506875334947.webp?v=1790234313","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/aqua-medic-ph-4-test-fluid-60ml","provider":"Nicks AOT","version":"1.0","type":"link"}