Hi Jim,
   
  The Hack reagants only measure the ionic content of the solution. An AA or 
the new device measures of the same family measure total silver and then they 
have to subtract the ionic portion.
   
  "Ole Bob"

Jim Holmes <[email protected]> wrote:
                Hi Bob,
   
  If you are still using the Hach reagents, then are you measuring total 
silver, rather than just the ionic portion?