When you buy the test kit, it will come with everything you need, including directions and how to evaluate your water test results. Follow the directions EXACTLY as directed and you should be fine.Yea got this product on Amazon India but how do I use this product and is it compulsory to install this for an aro
IMO, if you care about keeping fish, and, want to reduce the guess work out of the most important factor in the tank (water quality), then being able to test your water parameters for any tank is a must have. If you want to just guess it, then you don't need to spend the $20 bucks and few minutes to learn. That's your call ;-)