The DM-1 Dual Inline TDS Meter from HM Digital is one of the most important reverse osmosis accessories. This tool monitors the TDS of your reverse osmosis system in two places and lets you know exactly how the system is performing.

Most common fittings used –

Source water input: 1/8″ MNPT x 1/4″ Push Connect

Waste water output: 1/8″ MNPT x 1/4″ Push Connect

Product water output: 1/8″ MNPT x 1/4″ Push Connect Check Valve