help with Hanna phosphate checker

[straightrazorguy]

Originally Posted by Amadod2

when i do my first reading i get .17 and the next two i get .10, im just wondering if any of you use a hanna checker and what is the most accurate way of using it

It could be that the reagent powder isn't completely dissolved for your first reading. It takes me a few minuted to get all the floaties dissolved...

Either way, in the grand scheme of things, the difference between 0.10 and 0.17 isn't the end of the world. Or is it?