HM Digital DM-1 Dual Inline TDS Meter

Measure and monitor your water quality in real time—before and after filtration.

Designed for all water filtration and reverse osmosis systems. Ideal for RO/DI setups, coolers, watermakers, and more.

Why Choose the DM-1 TDS Monitor?

• Real-Time Water Quality Insight: Instantly see the Total Dissolved Solids (TDS) levels of your input and output water.
• Know When to Change Filters: Monitor performance and get a clear indication when it's time to replace membranes or DI resin.
• Reliable and Easy to Use: Highly accurate digital readout with automatic shut-off to preserve battery life.

What’s Included

• Dual Inline TDS Display: Shows both incoming (feed) and outgoing (product) water TDS levels simultaneously.
• Quick-Connect T-Fittings: Includes two 1/4″ tee fittings for fast, easy installation.
• Pre-Installed Batteries: Comes ready to use with 2 x 1.5V LR44 button cell batteries included.

Compatible With:

• Reverse Osmosis (RO) Systems
• Deionization (DI) Filters
• Coolers, watermakers, and most inline water filtration systems
• Can be adapted to 3/8″ or 1/2″ systems (optional fittings required)

Specifications

• Measurement Range: 0–9990 ppm
• Accuracy: ±2%
• Resolution: 1 ppm (0–999), 10 ppm (1000–9990, with x10 indicator)
• Calibration: Factory calibrated with 342 ppm NaCl solution; adjustable with screwdriver
• Cable Length: 24.5″ including sensors
• Battery Life: Approx. 1000 hours continuous use
• Power Source: 2 x LR44 button cell batteries (included)
• Dimensions: 7.6 x 2 x 4.7 cm (3 x 0.8 x 1.9 in.)
• Weight: 79.4 g (2.8 oz.)
• Origin: Made in Korea by HM Digital
• Shipping: Free Australia-wide

Installation Tip

To ensure accurate readings and avoid damage during installation:

• Install the sensor probes straight and securely into the water line.
• Avoid over-tightening or angling the fittings, which could affect sensor performance or lead to leaks.

Usage Guidelines

• Use only with clean water lines free of debris or biofouling.
• Monitor both feed and product water regularly to track system health.
• Replace filters or membranes as soon as TDS readings indicate performance drop.

Keep your water system performing at its best with the HM Digital DM-1—your eyes on water purity at all times.

HM Digital SM-1EC Inline Conductivity Meter

Real-time monitoring of your water’s electrical conductivity.

Perfect for RO, DI, watermakers, coolers, and any inline filtration system.

Why Choose the SM-1EC Conductivity Monitor?

• Accurate EC Measurement: Tracks total dissolved solids via conductivity with ±2% precision.
• Easy System Maintenance: Live EC readings tell you exactly when to service filters or resin.
• User-Friendly Display: Single-line digital readout with auto-off after 10 minutes to save battery.

What’s Included

• SM-1EC Inline Monitor: Single-line digital conductivity display.
• 1/4″ T-Fitting: Quick-connect PVC fitting for simple installation.
• Batteries: 2 × LR44 button cells pre-installed (approx. 1000 hrs use).

Compatible With:

• Reverse Osmosis (RO) systems
• Deionization (DI) water systems
• Watermakers and coolers
• Aquarium and hydroponic setups

Specifications

• Range: 0–9990 µS/cm
• Resolution: 1 µS (0–999), 10 µS (1000–9990, with “×10” indicator)
• Accuracy: ±2%
• Conversion Factor: NaCl (avg. 0.5)
• Cable Length: 22″ (including probe)
• Fittings: 1/4″ T-fitting (3/8″ or 1/2″ optional)
• Power: 2 × LR44 button cells (included)
• Battery Life: ~1000 hrs continuous
• Size: 7.6 × 2 × 4.7 cm (3″ × 0.8″ × 1.9″)
• Weight: 79.4 g (2.8 oz)
• Origin: Made in Korea by HM Digital

Applications

• Monitoring RO membrane and DI resin performance
• Ensuring water quality in watermakers and coolers
• Managing conductivity in aquariums and hydroponics

Keep your filtration system performing at its best with the HM Digital SM-1EC—your trusted inline conductivity monitor.