API 5-IN-1 TEST STRIPS Freshwater and Saltwater Aquarium Test Strips 100-Count Box

I disagree with comments that say the strips are inaccurate. I bought a box of 100. When I got some alarming test results, I got the Master Test Kit. It turned out my KH was really 0, with low PH. I found the results to be very close to each other, though the results are easier to read on the Master Kit.Even though I have the Master Kit, I use the strips most of the time. A lot more convenient.

Use these strips for my Koi pond. Very easy very quick reading. Gave an overall view of what’s going on in my Pond.

I love the price point on these. They're a must-have for any aquarium owner and are ridiculously expensive if you purchase directly from a pet store. 10 for $25 versus 100 for the $11 that I paid for them. Great product!

Easy and works very well for quick and accurate-enough water checks. Not accurate enough for knowing exactly where your water is though. These are good to identify problems, not so good for precisely dialing in water parameters. That said, the fact that it is so easy means one will do it more, so hopefully one will know of issues before they become a problem. I prefer these for my kid's tank. I wish they had one that included an ammonia test on the all-in-one strip. I use another test kit for ammonia. The GH and KH on these are rough at best and not too useful for me.

Fish are still alive since last August.

I use these to test for nitrite, nitrates and PH, and from my tests using these vs standard drop bottle test kits are fairly accurate. I just want to be sure I don't need to do a water change so use these every few weeks to make sure all the bad parameters aren't building up. I hate having to break out the full test kit as i only use that if a major issue occurs or setting up a new tank or if dosing meds. PH is usually spot on, well best it can be with color gradient on strip, but good enough to let me know tank is stable. Overall very happy with product and saves time.

Excelente

These strips are easier to use than the API master test kits, which is why I initially just got them. They also test general and carbonate hardness (GH and KH, respectively), which are important and which those kits don't cover. Finally, these strips are MUCH safer to use - if your child under 12, say, has a tank they're testing it alone most of the time, get both this and the master kit, and make the master kit something you do together - with only you handling the chemicals for Ammonia and Nitrate testing.However...These strips, irritatingly, don't come with instructions. You can google for them, and find a PDF with them on the API website, but after I did that, I found that some of what those instructions say about ideal parameters for tropical fish are really at odds with what I'm reading a lot of other places - especially where hardness is concerned. I think there are even some disagreements with the instructions (which actually are provided, thank goodness) in their own Master Test Kit.Also, the results aren't ideally made for accuracy within the small range of results you're going to be dealing with most of the time. The scale is just too inprecise (like leaving the inches off a yardstick) where you want to know more detail - and that isn't helped by the fact that it's a difficult judgement call which color things have turned too often. The low end of the Nitrite and Nitrate readings, especially, are extremely difficult to distinguish from each other on the basis of tiny differences between very similar shades of pink - and you really, really need to know those results, especially starting up a tank, and you should hope you never see them stray too far from that small range where it is the most difficult to read what's going on with these strips.I trust API's quality to be higher than many of the other test strips out there, but they're still riddled with issues. I can't recommend anyone rely on them alone.