I recently bought a TDS(Total Disolved Solids) meter to measure ppm. I just wanted to know if that was a good way of testing. It said it had been calibrated before shipment. Thanks, Carol
--- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.282 / Virus Database: 150 - Release Date: 9/25/01
