HM Digital - Hand Held TDS Meter
TDS (total dissolved solids) meters are essential for monitoring the performance of your R.O. system.
According to HM Digital; Total Dissolved Solids are minerals, salts, metals etc. dissolved in a given volume of water. TDS is measured in mg per unit volume of water (mg/l) or parts per million (ppm).
HM's range of TDS test equipment starts with the HMTDSEZ, an economy model for basic water testing applications (0 - 9990 ppm). The meter is factory calibrated with 342ppm NaCl solution & it can be re-calibrated with a mini-screwdriver.