Jovitec Universal Ph Test Paper Strips Ph Test Strips Roll, Measure Full Range 0-14 Each 16.4 ft(2 Rolls)

I'm very happy with these. My friends will sometimes complain that the tapes don't last long enough. But this is because my friends pull-out a 4-inch strip each time they take a measurement. Personally, I cut a 1/2-inch strip and then dunk it with a pair of stainless steel tweezers. Works great. One roll of tape will last me almost six months. Also... each roll contains its own color chart. I don't need to worry about losing a separate card or other paper that has the color codes on it. And a roll of tape is cheap enough, that I don't get upset if I lose one. (Or if my friends "borrow" a roll.) What's not to like?

Perfect for use in a science classroom. Having multiple packs made it very easy for the students to use in groups. Allows for different size of strips needed as necessary!

They came on time and each spool was in a cardboard box and then both boxes were placed inside of a sturdy plastic zip lock bag. The spool of ph paper is wrapped inside of the case with some sort of aluminum covered type of paper. I presume this is to protect the ph paper until you receive it and are ready to use it. To open the case and unwrap the ph paper I just slightly twisted and pulled apart the two pieces of the plastic casing to reveal and remove the wrapped spool of ph test paper then I reinserted the unwrapped ph test paper into the plastic case with the end of the ph test paper coming through the little slot on the case which then enables you to pull the desired length of ph test paper you require then you use the little serrated toothed edge on the case to help tear the piece of pH test paper off to use for testing. I performed a couple quick ph test using this product as you can see in the picture I provided it shows two longer yellowish strips one of those was used to test tap water and the other was used in spring water, the orangish colored test result strip was sweetened peach iced tea and the short little yellow test strip was saliva they all showed to be in the proper ph according to what google said they should be so I think it is safe to say they work! I will be using them when I make homemade skin care products as some of these items need to have their ph adjusted so they are not so harsh on the skin. It says each spool is 5 meters long I am actually surprised they did not appear to be that long and I have not measured them yet! But if they are indeed 5 meters each and if you used strips that are approximately an inch long you could get close to 196 ph test strips per spool! Which I think is an amazing deal for the price however I have not comparison shopped to be sure of this. I bought the 2 spool package since I was not sure of the quality and price and I was short on funds at the time. In the future I would probably order a larger package after I researched and determine how long the ph test strip paper is good for in storage and if it is actually the best deal. However these two spools may last me a lifetime with the amount of test I can perform depending on how easily it is to adjust the formulas I make... idk time will tell! I only make products for myself so I don't need these very often and they are only needed for certain formulas it all depends on the recipe and products that go into them if I need to check the ph levels and adjust them. Having the ph test paper now enables me to make formulas I have not been able to make and try in the past! So this is exciting! Knowing me I will probably also be testing all of the formulas I make even the ones that have claimed do not need to be tested and adjusted just to be sure they are correct! Trust no one and nothing! ;)

It's a handy test for phosphoric acid sanitizing solution (starsan) that just needs to peg the acid needle in the 0-3 range. I suspect it would not be very specific across the full range since there is only one test. For something the needs more precision like wine PH, I would use something different.

Excellent product. Amazingly fast delivery.

I had my husband take this litmus paper to his lab and test it's accuracy using a well calibrated pH meter. I wanted something that would give me ballpark accuracy at home. Unfortunately, this paper isn't anywhere near the ballpark - unless you're only testing very acidic liquid. It was accurate within the range of pH 2.5 - 5. Above those readings, which most all physiological and many food readings will lay, it becomes much less accurate. This picture gives a general overview of his results. Although the litmus paper dried and often lost its initial coloration, the reading is written next to the paper. For example, a sample of pH 11 tested as pH 8 using the paper. Useless. I'm throwing these rolls in the garbage!

Purchased for a science project. The kids were to blow air with a straw into a cup of water and then test the ph and compare with a cup that had not. There was no difference when I put the test strip in. I tested it on a couple things and the change was slow. It’s just not very vibrant and maybe slow to use. I’ve made my own with purple cabbage before and they seemed to work better. Not sure if it was simply a failed experiment or faulty strips. But I did test the strips on other things and the performance was eh.

works fine broad pH range, good for Quick pH QC checks