Dual in-line TDS test meter. The perfect solution for monitoring TDS levels, either before and after Reverse Osmosis systems or pre and post filtration set up.
The Sensor stems are all 1/4" John Guest style Tee fittings and can be incorporated with most filtration systems.
Once flow rate has been established, the user can choose between 'water in' and 'water out' to get a ppm TDS reading.
Note: Batteries are included