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HM Digital (TDS-3) Handheld Digital TDS Meter

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HM Digital (TDS-3) Handheld Digital TDS Meter

The HM Digital TDS-3 is a pocket-sized digital meter that measures total dissolved solids from 0 to 9990 ppm and water temperature from 0 to 80°C with automatic temperature compensation. At just 34 grams and 5.5 inches long, it's the smallest professional-grade TDS meter available, designed for water filtration verification, aquarium maintenance, hydroponics, and field testing.
SPECIFICATIONS

Key Performance Metrics

TDS Range
0–9990 ppm
Dual range with auto-switching resolution
Temperature Range
0–80°C
Built-in digital thermometer
Accuracy
±2%
Factory calibrated to 342 ppm NaCl
Resolution
1 ppm / 1°C
10 ppm resolution above 1000 ppm
Battery Life
1000 hours
Two 1.5V button cells included
Weight
34 grams
Pocket-portable design
TECHNICAL DETAILS

HM Digital TDS-3 Specifications

Model Number TDS-3
Measurement Units ppm (mg/L) for TDS, Celsius for temperature
ATC Range 1–50°C (33–122°F) automatic compensation
Display Features Hold function, auto-off after 10 minutes, x10 indicator
Calibration Factory calibrated, field recalibration possible with mini screwdriver
Dimensions 14 x 2.3 x 1.5 cm (5.5 x 0.9 x 0.55 inches)
Power Source 2 x 1.5V button cell batteries (included)
COMPATIBILITY & APPLICATIONS

Where to Use the TDS-3

The HM Digital TDS-3 is ideal for verifying reverse osmosis system performance, testing drinking water quality, monitoring aquarium conditions for saltwater and freshwater fish, managing hydroponic nutrient solutions, checking colloidal silver concentrations, and field testing of wells, streams, or municipal water. Commercial applications include water cooler servicing, pool and spa maintenance, wastewater monitoring, and aquaculture facility management. The hold function lets you take readings in tight spaces and record measurements later, while the auto-off feature preserves battery life during field work.

💧 Pro Tip: Test your RO system output regularly with the TDS-3. Pure RO water should measure under 10 ppm. If your reading climbs above 20-30 ppm, it's time to replace your membrane or check for bypass issues.
$22.20
HM Digital (TDS-3) Handheld Digital TDS Meter—
$22.20

Product Information

Shipping & Returns

Description

The HM Digital TDS-3 is a pocket-sized digital meter that measures total dissolved solids from 0 to 9990 ppm and water temperature from 0 to 80°C with automatic temperature compensation. At just 34 grams and 5.5 inches long, it's the smallest professional-grade TDS meter available, designed for water filtration verification, aquarium maintenance, hydroponics, and field testing.
SPECIFICATIONS

Key Performance Metrics

TDS Range
0–9990 ppm
Dual range with auto-switching resolution
Temperature Range
0–80°C
Built-in digital thermometer
Accuracy
±2%
Factory calibrated to 342 ppm NaCl
Resolution
1 ppm / 1°C
10 ppm resolution above 1000 ppm
Battery Life
1000 hours
Two 1.5V button cells included
Weight
34 grams
Pocket-portable design
TECHNICAL DETAILS

HM Digital TDS-3 Specifications

Model Number TDS-3
Measurement Units ppm (mg/L) for TDS, Celsius for temperature
ATC Range 1–50°C (33–122°F) automatic compensation
Display Features Hold function, auto-off after 10 minutes, x10 indicator
Calibration Factory calibrated, field recalibration possible with mini screwdriver
Dimensions 14 x 2.3 x 1.5 cm (5.5 x 0.9 x 0.55 inches)
Power Source 2 x 1.5V button cell batteries (included)
COMPATIBILITY & APPLICATIONS

Where to Use the TDS-3

The HM Digital TDS-3 is ideal for verifying reverse osmosis system performance, testing drinking water quality, monitoring aquarium conditions for saltwater and freshwater fish, managing hydroponic nutrient solutions, checking colloidal silver concentrations, and field testing of wells, streams, or municipal water. Commercial applications include water cooler servicing, pool and spa maintenance, wastewater monitoring, and aquaculture facility management. The hold function lets you take readings in tight spaces and record measurements later, while the auto-off feature preserves battery life during field work.

💧 Pro Tip: Test your RO system output regularly with the TDS-3. Pure RO water should measure under 10 ppm. If your reading climbs above 20-30 ppm, it's time to replace your membrane or check for bypass issues.