help with Hanna phosphate checker

[The Guy]

I always get the little package open and ready to add to the testing sample bottle for C-2 test before I start the test procedure, you have max 3 mins. to dissolve the powder for C-2 test and make sure you have a dry soft rag on hand to polish off all the finger prints on the test bottle before you put it in the checker for both C-1 & C-2 testing.
Hope this helps.