DM-3 Commercial In-Line Dual EC TDS Monitor
Technical Resources
Technical Resources
DM-3: Commercial In-Line Dual EC/TDS Monitor
Stay in control of your water quality with the DM-3 Commercial In-Line Dual EC/TDS Monitor. Designed for professionals, this real-time monitoring device ensures precise measurement of feed and product water in your water filtration system. Perfect for Reverse Osmosis (RO) systems, Deionized water (DI) setups, aquariums, hydroponics, and more.
Key Benefits and Features
- Dual Measurement Capability: Simultaneously measure EC and TDS levels for both feed (input) and product (output) water. Get instant insights into your filtration system's efficiency.
- Large Backlit Display: The screen is backlit for easy reading, even in dark environments. No need to squint or use flashlights.
- Advanced Microprocessor Technology: Highly efficient and accurate for consistent and dependable readings.
- Factory-Calibrated for Accuracy: Pre-calibrated with a 342 ppm NaCl solution and equipped with digital calibration for long-term precision.
- Durable and Practical Design: Features shielded sensor cables and diagnostic error messaging for reliable performance in demanding conditions.

How It Works
The DM-3 monitor is easy to set up and use. Simply connect its dual 1/4″ diameter electrode probes to your water filtration system's feed and product lines. The large backlit display provides EC and TDS readings instantly. Shielded cables and diagnostic messaging ensure consistent and clear readings with minimal interference.
Detailed Specifications
| Specification | Details |
|---|---|
| Measurement Range | EC: 0–9999µS / 0–9.99mS TDS: 0–5000ppm / 0–5ppt |
| Resolution | EC: 0.1µS to 10µS, 0.01mS TDS: 0.1ppm to 10ppm, 0.01ppt |
| Accuracy | ±2% |
| Calibration | Factory-calibrated (NaCl 342 ppm) |
| Power Source | 2 x AA batteries (included) |
| Cable Length | 1.2m (3.9 ft), shielded cables |
| Size | 11.6 x 1.9 x 7.0 cm |
| Weight | 225 g (7.9 oz.) |

Ideal Applications
- Reverse Osmosis Systems (RO): Monitor water quality for premium filtration.
- Deionized Water Systems (DI): Ensure impurity-free output water.
- Hydroponics: Keep nutrient solutions within perfect ranges.
- Aquariums: Maintain ideal water conditions for aquatic life.
- Drinking Water Treatment: Confirm water purity for safe consumption.
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