Watersafe WS425B Drinking Water Test Kit 2 CT

Works well as far as I can tell. Warning: these things have expiration dates. Not sure if that's actually something to worry about, but I didn't know that when I ordered the 2 pack. I was planning to use these on a yearly basis to see if there's a change in my water quality.Also, be super careful with the bacteria test. It's apparently easy to get a false positive if you accidentally introduce bacteria from your hands or dirty tap.