They work very good . My aquarium is doing a lot better.

You have to be very careful not to let the water run each other the colors will bleed together

I got these test strips while my usual ones were getting shipped over since there were only 10. Then I tested them and everything about the water was high: Total Hardness/GH, Alkalinity/KH, and pH. Tried another one and had the same results. Had a minor freak out, but everything inside the tank seemed fine, so I just let it be. Usual test strips arrived and showed nothing wrong. Got another set and confirmed it. Save some time and energy and get some new, (good) test strips, before you run out.

The test strips are a little small and didn’t quite understand colors on strips

i tried these strips first and they are really bad, for one the colors of the pads can be 2 colors on one pad making it a guess what the reading should be. Another reaon these are bad is because when you compare the readings to the more accurate liquid vial tests, the readings tend to be low for ph, my vial test says 7 but these strips are reading less than 6. if you want easy and accurate readings, the API test strips are much better, the readings are accurate when you compare them to the vial tests, and the pads dont bleed multiple colors.

I bought these when I ran out of my API test strips since they were a little cheaper. Wish I wouldn't have. They bled terribly and it showed all the tests were dramatically higher than they actually were. Doesn't help that the bottle they come in have different instructions than the box. Do not reccomend.

Great product. Have bought similar ones in the past. Reasonably priced and easy to use.

Despite multiple tests confirming otherwise, these strips simply give the lowest reading in each category. the parts of the strip bleed together. My tank's pH is currently 7.3, yet these strips read 5.5 every time. Do not buy.