HM digital COM-100 does all the PWT does and then some, for about $10 to $15 less if you count the free shipping on the COM-100.
 I have both and both measure conductivity exactly the same.
 I can't tell ya where to buy one..."commercial" list  thing ya know

ode

At 06:46 AM 4/6/2006 -0400, you wrote:

Where is cheapest place to get a PWT

  Bob


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