For reference, these are the strips in question:
Amazon.com: Keto-Diastix Reagent Strips for Urinalysis, Tests for Urine,Glucose, and Ketone, 100: Health & Personal Care
I've purchased them and used 3 times on my Lucy so far. Very easy to use (and she thankfully does not have diabetes).
It's difficult to get them to pee sometimes so I found that keeping a bottle nearby during play time is optional. If you see a fresh puddle, just dip a strip into it right away.