पि.एइस.मिटार: पुष्टिक बिजोंनि खारै आरो एसिदारि राहाफोरखौ नायनानै मोनसे थि पि.एइस. आव लगायनो हायो ।
pH meter : The acidity and the alkalinity of the nutritive medium could be examined and brought to a fixed pH .