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Baris 63: * [http://www.omega.com/techref/ph.html Introduction to pH] – Excellent overview of pH and pH measurement at the Omega Engineering website * [http://portal.acs.org/portal/PublicWebSite/education/whatischemistry/landmarks/beckman/index.htm Development of the Beckman pH Meter] – National Historic Chemical Landmark of the American Chemical Society [http://www.saka.co.id/product-detail/THERMO%20ORION%20SCIENTIFIC/stara1115-ph-meter-kit Digital Kit pH Meter] - THERMO ORION SCIENTIFIC [http://www.boojakascha.ch/index.php?page=laborratte_en DigitalAnalogPrinter] – Freeware compatible with the device shown in the article to monitor the pH in real time * 1. [https://smartgardenguide.com/best-ph-for-hydroponics/ What is The Best pH For Hydroponics]

PH meter: Perbedaan antara revisi