HM Digital DM-1 In-Line Dual TDS Monitor | 0-9990 ppm Range, +/- 2% Readout, Blue & White

Overview

The HM Digital DM-1 is an in-line dual TDS monitor designed to sit alongside your filtration setup. With a crisp blue and white enclosure, this compact unit tracks the TDS levels as water flows from source to product.

What it measures

Two electrode probes show TDS in feed water and in purified water, helping you observe how your filtration system performs in real time. The device covers a broad 0 to 9990 ppm range and offers a readout that stays reliable within about 2 percent of the measured value.

• Dual inline sensors provide feed and product water readings
• Measurement range spans 0 to 9990 ppm with +/- 2% accuracy
• Microprocessor-based readout for efficient and stable results

What’s in the box

Everything you need to monitor TDS arrives ready to install. The kit includes batteries, two sensors, and two 1/4 inch quick-connect fittings, plus the mounting hardware you need for quick setup.

• 2 sensors for IN and OUT measurements
• 2 x 1/4 inch quick-connect fittings
• Batteries powered for portability
• Basic mounting hardware and setup guide

Practical uses

Install the DM-1 on reverse osmosis, deionization, or other inline filtration to observe how effectively the system reduces dissolved solids. It works well for under-sink setups, coolers, or any inline filtration where a quick TDS check is helpful.

• Track filter performance over time
• Quick checks at the point of entry and point of use

How to read and install

Place the IN sensor on incoming water and the OUT sensor after your filtration stage. The clear readout presents TDS values at a glance, enabling you to gauge membrane or cartridge effectiveness without guesswork.

Why consider the DM-1

The DM-1 combines ease of use with precise sensing, offering a clear display and simple inline installation. While not a guarantee of results, it provides a practical way to verify filtration behavior and monitor water quality in evolving systems.