pH Dual Test Strips for Urine & Saliva (25 strips)

5 out of 5 stars Wednesday 19 April, 2017 By B Stephensen
It worked well and provided accurate results, tested with a liquid of known pH.
I first did this under an electric light and struggled to match the colours, I tried again in sun light and the colours match exactly, oops my bad.
I will be ordering more when I have used these. They arrived fast and were well packed.