Gives separate TDS readings of both incoming and product water. Includes all mounting hardware, fittings, and instructions. Can be ordered as an option to either the 1200 gallon or 600 gallon Watts R12 unit. Batteries included.
Note: A TDS tester is an absolutely necessary tool for maintaining a reverse osmosis unit. However, you can get by with a less expensive, hand-held tester. (See our "RO Parts" page for hand-held testers.)