HM Digital COM-100 Waterproof Professional EC/TDS/Temperature Meter

Product Name

HM Digital COM-100 Professional Waterproof EC/TDS/Temperature Meter | 0–9990 µS/cm EC | 0–8560 ppm TDS | Automatic Temperature Compensation | Replaceable Sensor

Brand

HM Digital

Model

COM-100

Product Series

Professional Series

Product Category

Water Quality Testing Instruments → EC / TDS Meters

Product Type

Digital EC, TDS & Temperature Combo Meter

Short Product Description

The HM Digital COM-100 is a professional-grade, waterproof EC/TDS/Temperature meter designed for comprehensive water-quality testing. It measures Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature, with multiple EC and TDS scales for different water-testing applications.

The meter offers an EC range up to 9990 µS/cm / 9.99 mS, TDS measurement up to 8560 ppm, automatic temperature compensation, digital push-button calibration, a replaceable sensor and IP67 waterproof protection.

Product Overview

The HM Digital COM-100 is designed for users who require more than a basic TDS tester.

Unlike simple TDS meters, the COM-100 provides multiple measurement modes for EC and TDS, allowing users to select the appropriate scale depending on the application and type of water being tested.

It can measure:

• Electrical Conductivity (EC)

• Total Dissolved Solids (TDS)

• Temperature

The COM-100 also incorporates Automatic Temperature Compensation (ATC) and uses different temperature coefficients and conversion factors to provide more appropriate readings across different water types.

Key Features

• Professional-grade EC/TDS/temperature meter

• Measures EC, TDS and temperature

• EC range up to 9990 µS/cm

• EC range up to 9.99 mS/cm

• TDS range up to 8560 ppm

• TDS range up to 8.56 ppt

• Supports 0.5 NaCl TDS scale

• Supports 0.7 442™ TDS scale

• Multiple EC/TDS measurement modes

• Automatic Temperature Compensation (ATC)

• Three temperature coefficients

• Non-linear EC-to-TDS conversion

• KCl, NaCl and 442™ conversion factors

• Digital push-button calibration

• Calibration to any point within the meter's range

• IP67 waterproof housing

• Fully submersible

• Meter floats when submerged

• Replaceable sensor

• Sensor model SP-C1

• Large LCD display

• Simultaneous temperature display

• Data-hold function

• Automatic shut-off

• Low-battery indicator

• Upgraded translucent protective cap

• Includes 2 × AAA batteries

• Includes lanyard

• Factory calibrated with 1413 µS solution

Technical Specifications

These specifications reflect HM Digital's current COM-100 product information.

EC Measurement

EC = Electrical Conductivity

EC measures the ability of water to conduct electrical current. It is commonly used as an indicator of the concentration of dissolved ionic substances.

COM-100 EC Range

0–9990 µS/cm

or

0–9.99 mS/cm

EC Resolution

TDS Measurement

TDS = Total Dissolved Solids

TDS represents the concentration of dissolved substances in water and is generally expressed in ppm or mg/L.

The COM-100 supports multiple TDS scales instead of using a single fixed conversion factor.

TDS Range

0–8560 ppm

or

0–8.56 ppt

Available TDS Scales

0.5 NaCl Scale

and

0.7 442™ Scale

The meter allows the user to select the appropriate conversion mode for the application.

Why Multiple TDS Scales Matter

Different types of dissolved substances can produce different relationships between EC and TDS.

The COM-100 therefore provides different conversion factors rather than simply multiplying EC by one fixed number.

The supported conversion approaches include:

• KCl

• NaCl

• 442™

The manufacturer's manual describes these as non-linear conversions intended to better represent different types of water and applications.

Automatic Temperature Compensation

The COM-100 includes Automatic Temperature Compensation (ATC).

Electrical conductivity changes as water temperature changes. The meter therefore compensates for temperature differences to help provide more consistent EC/TDS readings.

The COM-100 uses three temperature coefficients associated with its measurement scales.

Waterproof IP67 Housing

The COM-100 has an IP67 waterproof housing.

This means the meter is designed for protection against dust ingress and temporary immersion under the conditions defined by the IP67 rating.

HM Digital specifically describes the COM-100 as:

"submersible; floats."

This makes it particularly convenient for direct testing of water samples.

Replaceable Sensor

The COM-100 uses a detachable platinum electrode sensor.

Sensor Model

SP-C1

The replaceable sensor allows users to replace the electrode rather than replacing the complete meter when the sensor reaches the end of its usable life.

Digital Calibration

The COM-100 uses digital push-button calibration.

Unlike meters that require a screwdriver for calibration, the COM-100 allows calibration through its buttons.

The meter is factory calibrated using a 1413 µS conductivity solution and can subsequently be recalibrated to a desired point within its measurement range.

Display

The COM-100 features a large, easy-to-read LCD display.

The display provides:

• EC/TDS measurement

• Measurement unit

• Temperature

• Battery status

• Hold indication where applicable

Temperature can be displayed simultaneously with the primary measurement.

Data Hold Function

The Data Hold function freezes the displayed measurement.

This is useful when the meter is being used in a location where it is difficult to continuously view the screen.

Typical uses include:

• Recording water-quality measurements

• Comparing samples

• Field testing

• Laboratory measurements

• RO service inspections

Automatic Shut-Off

The COM-100 includes an automatic shut-off feature designed to conserve battery power.

Older HM Digital documentation specifies automatic shut-off after approximately 5 minutes of inactivity.

Low Battery Indicator

The meter includes a low-battery indicator, allowing the user to identify when the batteries need replacement.

Power Supply

Battery: 2 × AAA

The current upgraded COM-100 package includes two AAA batteries.

Dimensions & Weight

Dimensions

18.5 × 3.4 × 3.4 cm

7.3 × 1.3 × 1.3 inches

Weight

127 g

The compact handheld design makes it suitable for both laboratory and field applications.

Applications

Water Purification

The COM-100 can be used to compare conductivity/TDS before and after filtration and purification.

RO Water Testing

Useful for monitoring water quality associated with reverse-osmosis systems.

It can help compare:

Feed Water → RO Water → Filtered Water

Drinking Water

Can be used for general conductivity and TDS monitoring of tap and filtered water.

Hydroponics

EC is an important parameter for monitoring nutrient solutions.

The COM-100 can provide EC readings useful for hydroponic nutrient management.

Aquaculture

Useful for monitoring conductivity/TDS conditions in aquatic systems.

Aquariums

The multiple EC/TDS modes make the meter useful for freshwater and other aquarium applications.

Swimming Pools & Spas

Can be used for conductivity/TDS monitoring as part of broader water-quality testing.

Wastewater

Suitable for general conductivity monitoring in wastewater applications.

Boilers & Cooling Towers

EC monitoring can be useful for tracking dissolved ionic content in industrial water systems.

Laboratories

The COM-100 can be used for general laboratory water-quality measurements.

Environmental Testing

Useful for field measurements and environmental water monitoring.

HM Digital specifically lists water purification, wastewater regulation, aquaculture, hydroponics, laboratories, pools/spas, ecology testing, boilers/cooling towers and water treatment among the COM-100 applications.

Recommended Mode by Application

HM Digital's COM-100 guide provides examples of suitable modes for different applications.

Important: These are suggested modes, not universal requirements. Where a chemical, nutrient or equipment manufacturer specifies a particular measurement scale, that scale should be used.

How to Use

1. Remove the Protective Cap

Remove the translucent protective cap from the sensor.

2. Turn On the Meter

Press the power button.

3. Select the Measurement Mode

Choose the required EC/TDS measurement mode.

4. Immerse the Sensor

Place the electrode into the water sample.

Ensure that the sensing area is sufficiently immersed.

5. Wait for Stabilization

Allow the reading to stabilize.

6. Read the Measurement

Record the EC, TDS and temperature values shown on the display.

7. Use Hold if Required

Press the Hold function to freeze the reading.

8. Rinse the Sensor

After testing, rinse the sensor appropriately and replace the protective cap.

Calibration

For reliable measurements, periodic calibration is recommended.

Basic Calibration Procedure

1. Prepare a suitable certified conductivity calibration solution.

2. Turn on the COM-100.

3. Select the appropriate EC mode.

4. Rinse the sensor.

5. Place the sensor into the calibration solution.

6. Allow the measurement to stabilize.

7. Perform digital calibration using the meter buttons.

8. Rinse the sensor after calibration.

9. Replace the protective cap.

The COM-100 is factory calibrated at 1413 µS, according to HM Digital.

Care & Maintenance

For longer sensor life:

• Rinse the electrode after use.

• Keep the sensor clean.

• Avoid scratching the platinum electrodes.

• Do not use abrasive materials on the sensor.

• Calibrate periodically.

• Do not store the sensor dry for extended periods unless the manufacturer's instructions specifically permit it.

• Replace the sensor when it becomes damaged or readings cannot be stabilized properly.

Advantages

1. 3-in-1 Measurement

Measures:

EC + TDS + Temperature

2. Multiple Conversion Scales

Supports different EC/TDS conversion methods for different applications.

3. Professional Grade

Designed for professional water-quality testing.

4. IP67 Waterproof

Can be submerged for water testing.

5. Replaceable Sensor

The SP-C1 sensor can be replaced separately.

6. Digital Calibration

Convenient push-button calibration.

7. Automatic Temperature Compensation

Helps compensate for temperature-related changes.

8. Wide Measurement Range

Up to 9990 µS EC and 8560 ppm TDS.

9. Portable

Compact handheld design suitable for laboratory and field testing.

Ideal For

The HM Digital COM-100 is ideal for:

• RO technicians

• Water-treatment professionals

• Water filtration companies

• Laboratory technicians

• Hydroponic growers

• Aquaculture professionals

• Aquarium users

• Pool and spa technicians

• Environmental testing

• Industrial water treatment

• Boiler operators

• Cooling tower operators

• Research laboratories

• Water-quality professionals

• Home water testing

Product Highlights for Website

PROFESSIONAL 3-IN-1 WATER TESTING

EC + TDS + Temperature

WIDE EC RANGE

0–9990 µS/cm | 0–9.99 mS/cm

HIGH TDS RANGE

0–8560 ppm | 0–8.56 ppt

IP67 WATERPROOF

Submersible & Floating Design

AUTOMATIC TEMPERATURE COMPENSATION

Advanced ATC with Multiple Temperature Coefficients

REPLACEABLE SENSOR

SP-C1 Detachable Platinum Electrode

DIGITAL CALIBRATION

Push-Button Calibration

MULTIPLE TDS SCALES

NaCl | 442™ | KCl

Product Comparison Positioning

The COM-100 is positioned above basic single-parameter TDS meters because it provides:

EC + TDS + Temperature + Multiple Scales + ATC + Replaceable Sensor + IP67 Waterproofing

This makes it particularly appropriate for professional users who need more detailed water-quality measurements.

Package Contents

The upgraded COM-100 package includes:

• 1 × HM Digital COM-100 Meter

• 1 × SP-C1 Detachable Sensor

• 1 × Translucent Protective Cap

• 2 × AAA Batteries

• 1 × Lanyard

• User Documentation

HM Digital's current product page specifically lists the translucent cap, two AAA batteries and lanyard as upgraded included accessories.

E-Commerce Filter Specifications

Suggested HSN Code

Suggested HSN: 9027

Category: Instruments and apparatus for physical or chemical analysis.

For your Indian e-commerce listing, verify the final HSN/GST classification against your actual purchase invoice and current tax treatment before publishing it as a definitive tax attribute.

Country of Origin

Current Indian marketplace information lists the Republic of Korea as the country of origin for the HM Digital COM-100.

For your website, however, the safest practice is to verify the country of origin printed on the actual product packaging/import documentation in your inventory before publishing.

SEO Product Title

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SEO Meta Title

HM Digital COM-100 EC/TDS Meter | Professional Waterproof Water Tester

SEO Meta Description

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SEO Keywords

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Recommended Website Category

Water Testing Instruments → EC / TDS Meters → Professional Combo Meters

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One-Line Selling Description

HM Digital COM-100 is a professional waterproof EC/TDS/temperature meter featuring 0–9990 µS/cm EC measurement, up to 8560 ppm TDS, multiple conversion scales, automatic temperature compensation, digital calibration, IP67 protection and a replaceable platinum sensor for advanced water-quality testing.