In a message dated 11/7/03 4:59:01 AM, nprazeres@vodafone.pt writes: << Anybody knows anything close to a conversion table to relate this measurements that mean more or less the same concept? >> Yes, for conductivity and TDS. Approximate for DH. The Conductivity is 1.7 times the TDS for normal water. It will vary a little bit depending on the nature of the dissolved solids. The Degrees Hardness is the TDS divided by 44.5 for my water. Lee Harper Media, PA ----------------------------------------------------------------------- -- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader