No problem @toyman, we love to talk hydration and science!
We’d be keen to stay in the loop whilst you’re running your at-home testing and act as a soundboard for any hurdles you come across - as you’ve highlighted, repeatability is key, then you need to figure out the accuracy of your repeatable data!
I know Dave down in Santa Cruz would love to hear about your DIY testing and help provide some clarity with a PH Sweat Test.
Let us know how you get on with your at-home testing and if you do make it to Santa Cruz drop us a message after the test with your result!