Simon,

Leave the TDS1 meter alone it is not an instrument to meassure ppm. The name
implies
Totally Dissolved Solids and CS  IS NOT  a totally disolved solid.

I suspect you are new on the list. The peole to ask are Ivan, James Holeman,
brooks bradley, or myself.

When I first got on this list the TDS was a great item, but I have a
spectrophotometer for measuring ppm. So I bought one to debunk the whole
mess.  IT DOES NOT WORK.

Robert




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