I have always used the pool strips. Get the sample, walk to the counter, mix and dilute the sample, yadda, yadda. All well and good, until I tried these Foal-Time strips (LB advertisers, so I'm feeling free to toot their horn). SO simple to use. Walk up to the mare and get one drop of milk from her on the strip. EZ-PZ. Compare it to the color chart and you're done. So far, the strips have been 100% accurate. Mare hits 6.4 pH and you can count on a foal very soon. When my pool strips hit 6.4, I found the results extremely variable between then and time to foaling. The most recent foaling mare tested 6.7 at 2 p.m., then 6.4 at dinnertime, and foaled at 11:55 that night. I will never go back to the pool strips and feel 100% confidence in the use of the Foal-Time strips.