I ordered these at my wifes request for her use. They arrived within a few days. She is a retired Scientific Officer and was employed in an NHS lab for 40 years. She has osteoporosis and is trying an alkaline diet to aid her calcium absorption, so needs to monitor her urine pH.
To Quote her: "They cost more than some of the alternatives, but I would order these again, they are easy to use and just as good as the ones I used to use at work. They seem very sensitive, because if I have eaten too much acid forming food during the day, the pH of my urine will have altered the following morning to reflect this"