Phenol red pH test tablets swimming pool hot tub X50 Palintest

So easy to use have ensured spa safe all summer.

I'm sure they work well but I have given up using the Palintest pool tester and others like it because so much depends on the ambient light. I found that when you take a reading in one place then move to another where the light is slightly different and the two readings were often substantially different. I now use two different makes of testing strip and if the readings differ I take an average.

works as advertised

Bad supply!

Easy to use. Works everytime. So feel safe going in pool.

Bought these to demonstrate acid alkali reactions, ideally I'd have liked a stronger colour reaction but I can see how great these are if used for their intended purpose.

Good

Good