It works well for what it is designed to do
This is a good product for the correct test jar. AIH did not post what size vessel these are designed for. Not knowing better, I ordered a number of them. When I found they fit only one of my test jars, I wrote AIH. Now there is a note in the description & AIH took care of compensating me. I am satisfied, because they did not cost that much. I was able to "spring" the others open wide enough to make use of them, but I suspect they will split by this summer.
Reviewed by: Cockroach from Freak on 3/11/2019