Bluestone Rise. pH Test Strips. Litmus Indicator Test Paper Universal Acid Base. Full Range.1-14 Independently Tested for Colour Matching Accuracy. 10 Pack 800 Strips

The media could not be loaded.  These pH test strips are very useful for measuring pH in any liquid. As you can see in the video the white apple cider vinegar shows about 4.5 while Ammonia showed about 10.5 and a heavy-duty cleaner/detergent showed about 12.5. I just wished it was easier to differentiate between the colors on the package mostly in higher levels of alkalinity where the colors can be very close. The best reading seems to be right after application of the liquid to the strip as the color on the strip can fade away after a minute or so. I like the fact that each strip book comes in a separate packaging which prevents any accidental contamination. I prefer these to the electric pH meters because I don't have to deal with cleaning or calibration.

Works well and read my controlled test solution with perfect accuracy (as perfect as one can be when using a Litmus test). I paid $2.00 for 400 strips - how is that even possible?