Ph Test Strips, 160 Full Range Strips 1-14 Universal Litmus Paper Soap Making For Water Saliva Wine Urine Soil, 2 Packs Of And 6 Units

They are good and work as intended. It is difficult to judge by color, there is a subjective part. But this is normal with color strips pH indicator. They are not a scientific lab grade probe with digital display. They were never intended to be. Keeping that in mind, they work as supposed.

Great strips very convenient for testing my aquarium water

Je voulais vérifier le niveau d’acidité du verjus que je venais de préparer et c’est la manière la plus simple et la moins coûteuse que j’ai trouvé. Excellent.

These seem to work when you need a pH measurement in a pinch. I wouldn't use these for accuracy, but are easy to use and the colors change according to pH chart.

Here's my experience. I used them on straight water and it tested about where I thought it would be. I used them on lemon juice and it tested where it should be. I added lemon juice to water and it seemed to take about six times the amount as per a chemically tested recipe to increase the acidity than it should have. It seemed like at the extremes these are measuring just fine but the subtleties between aren't working. Are there variances in the acidity of lemon juice probably but I also tested the lemon juice and it was at the average where lemon juice is supposed to be... As per the strips. Unfortunately my control measurement is from the very strips that I'm testing. I nearly killed a lot of plants with high acidic water because I saw no change in the color until I added quite a bit of lemon juice to the water. I tried the water on a couple plants at the 6ph that it should be according to the strips and they nearly died. They did not enjoy that at all. So like title says I'm really not sure. I think these detect acidity and pH at the extremes but aren't working to the subtleties they're supposed to. I did everything with single drops as per the instructions and again unless there is an extreme change in the acidity I didn't see any change in the pH test paper.