Hello, I'm looking for any thoughts on meters to check the ppm. Someone told me you needed the Hanna PWT that costs about $60. I found a Hanna Primo for half that. The fellow that told me about the PWT says he checked the Primo and it wasn't accurate. I contacted the company that sold it to me and they said it basiclly has the same component inside as the Hanna PWT. I would like to be able to be fairly certain what ppm I'm making. Any comments on this is appreciated.
-Thanks Gary Native American style flutes & Matted photos by ~ Gajon ~ www.etsy.com/shop/gajon
