Now that certainly makes more sense, and I agree that a periodic retesting should be done. 10 year intervals sound about right. Twice a year for those under the age of 30!!! [img]/LDPforum/ubbthreads/images/graemlins/grin.gif[/img] [img]/LDPforum/ubbthreads/images/graemlins/grin.gif[/img]



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