Hi, I just want to say this. I have a hand-held pH meter and a TDS (Total Dissolved Solid) meter. Each only cost me US$50. The pH meter has a plastic probe and easy to replace. It can read up to 0.00. The TDS meter is exactly like the one you see in Petwarehouse catalog except it doesn't have "wardley" on it. It is priced $64.95. you can choose either ppm or microsiemen. Both meters have done me alot to help to spawn my discus and now apisto. If you want to know more, email me off the list. Ade Lau ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!