..and "rough" should be defined a bit to have any meaning.
A PWT will probably get you to within +/- 5 PPM in the 15 PPM range..much closer if your particular process and measuring procedure is verified against "your" meter within a specific narrow range by a good lab. [Say +/- 2 PPM?..which also includes the possibility of being "right on", but how do you know when that is? ]
All the meters are repeatable even though, if any two read the same at a given point in the same sample, it's a matter of chance.
Ode
At 10:34 PM 12/4/2004 +0000, you wrote:
>>>>
thanks ode .....so all i will get is a very rough idea,<<<<
Sue
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