BIONIX Total Hardness, Calcium, and Magnesium Test Kit for Freshwater is developed and manufactured under the expert supervision of Principal Aquaculture Scientist, Dr. B. K. Mahapatra (CIFE, Kolkata), ensuring high standards of accuracy and reliability.This Kit is ISO 9001:2015 certified and accredited by the International Accreditation Forum(IAF).You can measure Total Hardness, Calcium & Calcium Hardness, Magnesium & Magnesium Hardness. This test kit can perform over 100 tests, ranging from 0 to 3000 mg/l or ppm. Do not use this kit for Saltwater. This kit has a wide application in Aquariums, Fish farming, Aquaculture, Hydroponics, Aquaponics, Ras, Biofloc, Water treatment plants, and many other domains. This Kit comes with 5 Reagent bottles,1 test tube,1 Syringe,1 spoon, and 1 manual.The kit includes both printed manual and a video manual guide, thoughtfully designed to support a diverse range of users. Simply scan the QR code provided on the back of the product to access the printed manual, available in 12 major Indian languages, including HINDI, BENGALI, TAMIL, TELUGU, MALAYALAM, KANNADA, ODIA, PUNJABI, GUJARATI, MARATHI, ASSAMESE, and ENGLISH. A separate QR code is provided for the video manual guide, or simply visit our YouTube channel, “Bionix Water Test Kits,” for step-by-step instructions.