I like to keep track of my Nitrates, they help me determine when a water change is needed. I think it is very accurate. I would buy again! I just fill the tube up to the measuring line with tank water, then add the drops according to the directions. You must follow the directions exactly as written. Use bottle one, then shake up bottle 2 for 30 seconds. Then add the drops and shake for 1 minute. It's a little more work then test strips, but way more accurate.

Checked the results of these drops against other methods and the results matched. Easy to do the test.

Best tester out there.

Not only helpful for keeping fish from mysteriously dying but easy and fun to use. Livebearers now days are not as strong as they used to be in all types of water conditions and good water quality is essential. This product will let you know when your nitrite is down near zero with easy to use color codes.

works great, looks great, very happy with purchase

I worked in three pet shops as a teen and later managed the slat water department in a very large pet shop in Philadelphia. I have kept fish since I was five years old but have been on hiatus for the past 20 years and not had any tanks.These kits have been around for ages and are very accurate if you use them for their true intended purpose; freshwater community tanks or similar. Don't try and use these the nitrite or ammonia for saltwater tanks of any sort. Don't use the pH test kit for tanks that need exact pH values for high pH animals like cichlids (though this is less of a problem if you read below). These tests are extremely economical and provide many more tests per dollar than any other kits available.My son is six and my daughter is four. We decided to raise tadpoles twice this year and needed to monitor ammonia, nitrite, and pH. The 40-ish year old design of these kits still fit that bill perfectly and were exactly what we needed. I wish the scale on the pH kit went higher, but it goes high enough for community fish. Tadpoles here tend to like higher pH values of 8.2 and the pH kit doesn't go that high. However, I got a rough enough estimate if the pH test indicated that the pH was off the chart high as water isn't going to go much above 8.2 unless you use chemical inappropriately.Ammonia and nitrite test kits worked perfectly as in the past and averted many potential tadpole disasters and crying children. We've kept snails, clams, some minnows, and loads of plants in the tank while the tadpoles have developed so the bio load was always changing.Still great kits even after 40 years at a very affordable price.Highly recommended for their intended usage scenario.