The Dual In-Line TDS Monitor is an efficient and accurate tool for
measuring the TDS level of the water going into and coming out of the
Merlin Garden Pro reverse osmosis system. Measuring TDS is an excellent
way to know how well an RO system is working, and when the reverse
osmosis membrane needs replaced. The TDS Monitor measures from 0 to 999
ppm with a resolution of 1 ppm, and from 1000 to 9990 ppm with a
resolution of 10 ppm. Unit includes 3/8” and ½” quick connect fittings,
and is protected by a limited three-year manufacturer’s warranty.