PH тестер и его калибровка
Ph тестер является одним из базовых инструментов в сельском хозяйстве, делюсь своими знаниями в обращении с ним.
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![Comment Faire du VINAIGRE Maison GRATUIT (Fonctionne avec TOUS LES FRUITS) [INRATABLE]](https://sun9-45.userapi.com/7_H3ChJSqtJ3roGVBKXp6Sq7PcceiCSZuMGb2g/nw2_hvfwtOY.jpg)
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