Macherey-Nagel 92110 0-14 pH Indicator Strips 100/Box

I have a quite acidic vegetable fertilizer (kept acidic for long term storage) and I wanted to bring it to roughly neutral pH using a potassium hydroxide (KOH) solution I made from powder, and needed to figure out how much KOH to add. As with all pH test strips, these are nothing like a pH meter, but it was easy to figure out how to get things in the neutral range using these strips.I work in a university research lab, and Macherey-Nagel is a good brand. I would pay considerably more buying it from one of the scientific supply houses than the Amazon price so I am happy with what I paid given these are high quality.

These trips are excellent for determining pH level of various liquidS. I first learned about these strips on a kimmaytube YouTube video. She creates natural here concoctions and tests the pH level. I too wanted to do the same so I purchased these for that purpose. I am able to create here lotions and moisturizers while testing the pH level to make sure that it seals my cuticles after each wash and just for periodic use throughout the day or week. In order to get even more use out of them are usually cut each strip into two or three thinner pieces. This is fast and to me exceptionally accurate. I'm so in love with pH testing and none of the other strips can really compare. I trust this brand the most.

I use these strips for making skin care items and they work fine.

I would guess that the resolution of the strips is probably plus or minus one pH value, but that works just fine for when you want you want a rough indication of acidity or alkalinity. Fast and easy. Would use again.

These are great strips with a fairly easy to read chart on the package to tell where your pH reading is.I took a star off at the packaging is due for an overhaul. The box that holds these is made of cheap acrylic and came cracked. It isnt a huge deal, but I will have to be extra careful over the lifecycle of these 100 strips.The actual product is well worth the price, though.

We tried several of the highly rated pH strips for my child's science experiment and these are the only ones we'll continue using. The main issue with all the others has been that liquid would spread the dye from the different squares all over and the colors would get mixed up (shaking the liquid off doesn't really help because everything mixes anyway as you're shaking it off). These pH strips are the only ones where the colors stayed in their own squares and didn't contaminate the others. Consistency between readings has been very good and accuracy has been good as far as I can tell by testing things with known pH. I thought that the color guide was good, too: the colors on the strips faithfully represent the colors on the guide.

I have tried three brands to test the pH of skin care products that I need to alter with additives, and these are the most accurate and easy to read. Sometimes, depending on what it is, it takes a few minutes to complete changing colors while other times it is correct right away. That is the only difficulty with these. Make sure all 4 colors on strip are the closest match to the box ph #'s, & you will be very close to the correct pH! If you cannot get all 4 colors on the strip to match right off.. give it a few more minutes, and try comparing it to the Chart again- some items take longer than others to get a good read.

I was surprised that a big white sticker was placed over the PH chart. It makes it very difficult to compare my strip against the chart to determine what PH I have on whatever item I am sampling. I tried to peel that sticker off, but it comes off in pieces. It is frustrating, and was a very bad decision by someone.