Hm Digital - Meter, TDS, Inline, Dm-1, 1/4" Tee

Brand: HM Digital

HM Digital DM-1 Dual In-Line TDS Meter, 1/4" Tee

The HM Digital DM-1 is a dual-input in-line meter that measures total dissolved solids (TDS) for both feed and product water on reverse osmosis and water purification systems. The compact display switches between feed and product readings, allowing operators to track membrane rejection at a glance. This version ships with 1/4" quick-connect tee fittings for direct installation in 1/4" tubing.

Mounted on residential, commercial, and light industrial RO and DI systems where a permanent TDS readout is needed. Used to monitor membrane performance over time and identify when membrane replacement is required. Common on undersink RO, point-of-use coolers, and small commercial purification skids.

Available Options

• 1/4" quick connect tee fittings
• Dual-input feed and product display
• Dual range 0-9990 ppm

Key Features

• Displays feed and product TDS via in/out electrode probes
• Dual range 0-9990 ppm (1 ppm resolution to 999 ppm, 10 ppm above)
• Advanced microprocessor electronics
• Auto-off after 10 minutes of non-use
• Factory calibrated with 342 ppm NaCl solution
• Recalibration via mini-screwdriver
• Quick installation with included 1/4" quick-connect fittings

Why Choose HM Digital DM-1 Dual In-Line TDS Meter, 1/4" Tee

The DM-1 delivers permanent, dual-source TDS monitoring at a price point suited to residential and light commercial RO. Field recalibration support and quick-connect installation keep service time and cost low.

Ideal Applications

• Undersink reverse osmosis systems
• Point-of-use water coolers
• Small commercial RO skids
• Deionization systems
• Residential water purification