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IN-LINE DUAL EC/TDS MONITOR FOR WATER FILTRATION
The DM-3 in-line dual EC/TDS monitor measures feed water and product water in a filtration system at the same time. Two sensor probes let operators compare the water entering and leaving the system, while the large backlit LCD keeps readings easy to view in dim environments. Shielded sensor cables, diagnostic messages, and individual digital calibration for each line make the DM-3 a practical choice for commercial and industrial water monitoring.
It is suited to reverse osmosis (RO) and deionized (DI) water systems, as well as drinking water treatment, aquariums, hydroponics, and other applications where monitoring both sides of a filtration process is useful.
1. Dual-channel monitoring — displays TDS readings for feed water and product water using separate in-line probes
2. EC and TDS measurement — measures both electrical conductivity (EC) and total dissolved solids (TDS)
3. Backlit LCD — large, backlit display for viewing measurements in low-light conditions
4. Automatic power-off — power-off after 3 minutes helps conserve battery power
5. Calibration — factory calibrated with a 342 ppm NaCl solution; each line can be recalibrated digitally and independently
6. Diagnostics — diagnostic error messages help identify measurement or system issues
7. Shielded sensor cables — shielded cables support reliable installation in water filtration systems
8. Included fittings — two 1/4-inch T-fittings are included; 3/8-inch and 1/2-inch fitting options are also available
The display reports the two measurement lines side by side, with the unit shown for each channel. The front panel carries the setting, calibration, and escape keys below the screen.
Two-line readout on the display | 
Setting, calibration, and escape keys |
| Measurement range – EC | 0–9,999 µS; 0–9.99 mS |
| Measurement range – TDS | 0–5,000 ppm; 0–5 ppt |
| EC resolution | 0–99.9 µS: 0.1 µS; 100–999 µS: 1 µS; 1,000–9,990 µS: 10 µS; 0.00–9.99 mS: 0.01 mS |
| TDS resolution | 0–99.9 ppm: 0.1 ppm; 100–999 ppm: 1 ppm; 1,000–5,000 ppm: 10 ppm; 0.00–5.00 ppt: 0.01 ppt |
| Accuracy | ±2% |
| TDS conversion factor | NaCl, factor 0.5 |
| Calibration | Factory calibrated to 342 ppm NaCl; each line can be recalibrated separately |
| Sensors | Two sensors; 1/4-inch diameter for quick-connect fittings |
| Cable length | 1.2 m (3.9 ft), shielded cables |
| Included fittings | Two 1/4-inch T-fittings |
| Power supply | 2 × AA batteries |
| Dimensions | 11.6 × 1.9 × 7.0 cm (4.6 × 0.7 × 2.8 in) |
| Weight | 225 g (7.9 oz) |
1. Industrial design — designed for commercial and industrial applications
2. Housing — reinforced, water-resistant housing
3. Independent calibration — each measurement line is calibrated on its own
4. Extra-large LCD — clear, easy-to-read measurements
5. Longer cables — shielded sensor cables sized for water-system installation
6. Variable mounting bracket — flexible positioning during installation
7. Slim profile — compact installation in tight equipment panels
Fittings in 3/8-inch or 1/2-inch sizes are available as alternatives to the included 1/4-inch T-fittings.
💡 Need a dual-channel EC/TDS monitor for your water system?
Contact our sales team today for bulk pricing, technical support, or to request a demo unit.
Or Email us: tlead.net@hotmail.com