HM Digital COM-360 Professional Waterproof pH/EC/TDS/Temperature Meter

Product Name

HM Digital COM-360 Professional Waterproof pH/EC/TDS/Temperature Meter | 0–14 pH | 0–9990 µS/cm EC | Up to 8560 ppm TDS | Automatic Temperature Compensation

Brand

HM Digital

Model

COM-360

Product Series

Professional Series

Product Category

Water Quality Testing Instruments → Multiparameter Water Quality Meters

Product Type

Digital pH / EC / TDS / Temperature Combo Meter

Short Product Description

The HM Digital COM-360 is a professional multiparameter water-quality meter designed to measure pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature in a single handheld instrument.

It provides a pH range of 0–14, EC measurement up to 9990 µS/cm / 9.99 mS/cm, TDS measurement up to 8560 ppm on the 0.7 scale and 5000 ppm on the 0.5 scale, along with automatic temperature compensation.

The COM-360 features digital push-button calibration, a large LCD with simultaneous temperature display, replaceable sensor assembly and a water-resistant housing. It is designed for water purification, hydroponics, aquaculture, wastewater, laboratories, pools and spas, water treatment and other water-quality applications.

Product Overview

The HM Digital COM-360 combines four important water-quality measurements in one portable instrument:

pH

Measures the acidity or alkalinity of a liquid on a 0–14 pH scale.

EC

Measures Electrical Conductivity, indicating the ability of water to conduct electricity.

TDS

Measures/derives Total Dissolved Solids using selectable conversion scales.

Temperature

Measures water temperature and provides temperature compensation for the pH/EC/TDS measurements.

This makes the COM-360 particularly useful when users need a single instrument for multiple water-quality parameters instead of carrying separate pH, EC and TDS meters.

Key Features

• 4-in-1 water-quality testing

• Measures pH, EC, TDS and temperature

• pH range: 0–14 pH

• EC range: 0–9990 µS/cm

• EC range: 0–9.99 mS/cm

• TDS range up to 8560 ppm

• TDS range up to 5000 ppm depending on selected scale

• Supports 0.5 NaCl and 0.7 442™ TDS scales

• Automatic Temperature Compensation (ATC)

• Three temperature coefficients

• Non-linear EC-to-TDS conversion

• Digital push-button calibration

• pH calibration at pH 4, 7 or 10

• EC/TDS calibration anywhere within the meter's range

• Large, easy-to-read LCD

• Simultaneous temperature display

• Data-hold function

• Automatic shut-off

• Low-battery indicator

• Replaceable sensor

• Water-resistant housing

• Factory calibrated for pH/EC/TDS

• Compact handheld design

• Powered by 2 × AAA batteries

• Includes calibration solutions and storage solution

Technical Specifications

HM Digital's current COM-360 page specifies the above core specifications; HM Digital's catalog also provides the detailed resolution and calibration information.

pH Measurement

The COM-360 provides a 0–14 pH measurement range.

pH Range

0.0–14.0 pH

Resolution

0.1 pH

Accuracy

±0.1 pH

The meter uses a replaceable glass pH sensor with reference electrodes.

pH Calibration

The COM-360 supports digital automatic pH calibration.

Available calibration points:

• pH 4

• pH 7

• pH 10

This provides flexibility when testing acidic, neutral or alkaline water.

For best accuracy, use fresh, appropriate certified pH buffer solutions and calibrate according to the application and measurement range.

EC Measurement

EC = Electrical Conductivity

EC indicates the ability of water to conduct an electrical current and is commonly used as an indicator of dissolved ionic content.

EC Range

0–9990 µS/cm

or

0–9.99 mS/cm

EC Resolution

TDS Measurement

TDS = Total Dissolved Solids

The COM-360 supports two main TDS scales:

0.7 / 442™ Scale

0–8560 ppm

0.5 / NaCl Scale

0–5000 ppm

The selectable scales allow users to choose a conversion appropriate for their application.

The COM-360 uses non-linear EC-to-TDS conversion methods for KCl, 442™ and NaCl solutions.

Temperature Measurement

The COM-360 measures water temperature along with the selected water-quality parameter.

Temperature Range

0–55°C

32–130°F

Resolution

0.1°C / 0.1°F

Accuracy

±1°C / ±1.8°F

The temperature value is displayed simultaneously on the LCD.

Automatic Temperature Compensation

The COM-360 includes Automatic Temperature Compensation (ATC).

Water-quality measurements such as EC and pH can be affected by temperature. ATC helps compensate for temperature-related variations and improves measurement consistency.

The COM-360 uses three temperature coefficients as part of its compensation system.

Replaceable Sensor

The COM-360 features a replaceable sensor assembly, model:

SP-CP

The probe combines the pH sensing element with EC/TDS measurement electrodes.

A replaceable sensor helps extend the overall useful life of the meter by allowing the sensing assembly to be replaced separately.

Calibration System

The COM-360 uses digital push-button calibration.

pH Calibration

Automatic calibration at:

• pH 4

• pH 7

• pH 10

EC/TDS Calibration

Digital calibration can be performed to a selected point within the meter's measurement range.

The instrument is factory calibrated for pH/EC/TDS.

Display

The COM-360 features a large, easy-to-read LCD screen.

The display provides:

• pH / EC / TDS reading

• Measurement unit

• Temperature

• Selected measurement mode

• Battery indication

• Hold indication where applicable

Temperature is displayed simultaneously with the primary measurement.

Water-Resistant Housing

The COM-360 uses a water-resistant housing designed for water-quality testing.

Important: HM Digital's current COM-360 page describes the housing as water resistant. It should not be advertised as IP67 waterproof unless the specific version supplied in your inventory carries that rating.

Data Hold

The built-in Data Hold function allows users to freeze the current reading on the display.

Useful for:

• Recording measurements

• Field testing

• Laboratory testing

• Comparing samples

• Working where the display is difficult to view continuously

Automatic Shut-Off

The COM-360 includes an automatic shut-off function to conserve battery life.

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

Low Battery Indicator

A built-in low-battery indicator alerts the user when the batteries require replacement.

Power Supply

2 × AAA alkaline batteries

The batteries are included with the current product package.

Dimensions & Weight

Dimensions

20.0 × 3.4 × 3.4 cm

Approximately:

7.8 × 1.3 × 1.3 inches

Weight

Approximately 110 g

HM Digital's catalog gives approximately 130 g for a catalog configuration including batteries, while the current product page lists 110 g. For your website, use the weight of the actual packaged/product revision you stock if shipping weight is required.

Applications

1. Water Purification

The COM-360 can be used to monitor pH, EC and TDS in water purification processes.

2. RO Water Testing

Useful for checking changes in pH, EC and TDS before and after reverse-osmosis filtration.

3. Drinking Water

Can be used for general water-quality monitoring.

4. Hydroponics

Useful for monitoring:

• pH

• EC

• TDS

• Temperature

These parameters are important when managing hydroponic nutrient solutions.

5. Aquaculture

Useful for monitoring multiple water parameters in aquaculture systems.

6. Aquariums

Can be used for general water-quality monitoring in aquarium systems.

7. Wastewater

Useful for monitoring pH, conductivity and dissolved-solids indicators.

8. Pools & Spas

Can be used as part of broader pool and spa water-quality testing.

9. Laboratories

Suitable for general scientific and laboratory water testing.

10. Environmental Testing

Useful for field and laboratory ecological water-quality measurements.

11. Boilers & Cooling Towers

EC and TDS measurements can be useful in monitoring industrial water systems.

12. Water Treatment

Suitable for professional water-treatment applications.

HM Digital specifically identifies water purification, wastewater regulation, aquaculture, colloidal silver, laboratory/scientific testing, pools/spas, ecology testing, boilers/cooling towers and water treatment as applications.

Recommended Applications Table

Package Contents

The current HM Digital product page lists the following accessories:

• 1 × HM Digital COM-360 Meter

• 1 × Translucent Protective Cap

• 2 × AAA Alkaline Batteries

• pH 4 Calibration Solution

• pH 7 Calibration Solution

• pH Storage Solution

• 1 × Lanyard

The COM-360 is factory calibrated for pH/EC/TDS.

How to Use

Step 1 — Remove the Cap

Remove the protective cap from the sensor.

Step 2 — Turn On

Switch on the COM-360.

Step 3 — Select the Required Mode

Select:

• pH

• EC

• TDS

depending on the measurement required.

Step 4 — Immerse the Probe

Place the sensor into the water sample.

Step 5 — Wait for Stabilization

Allow the reading to stabilize.

Step 6 — Read the Display

Read the selected parameter along with the displayed temperature.

Step 7 — Hold the Reading

Use the Hold function if you need to record the measurement.

Step 8 — Rinse the Probe

Rinse the sensing assembly appropriately after testing and follow the manufacturer's storage recommendations.

Maintenance

For reliable long-term performance:

• Keep the sensor clean.

• Rinse the probe after testing.

• Calibrate periodically.

• Use fresh calibration solutions.

• Do not scratch the pH glass sensor.

• Keep the pH electrode properly stored.

• Replace the sensor when it reaches the end of its service life.

• Replace batteries when the low-battery indicator appears.

Advantages

4-in-1 Water Testing

One instrument measures:

pH + EC + TDS + Temperature

Multiple TDS Scales

Supports both:

0.5 NaCl

and

0.7 442™

scales.

Automatic Temperature Compensation

Helps compensate for temperature effects.

Replaceable Sensor

The SP-CP sensor can be replaced separately.

Digital Calibration

Simple push-button calibration.

Portable

Compact handheld form factor.

Large LCD

Easy-to-read display with simultaneous temperature.

Professional Applications

Suitable for laboratories, water treatment, hydroponics, aquaculture and industrial water-quality testing.

Ideal For

The HM Digital COM-360 is ideal for:

• Water-treatment professionals

• RO technicians

• Water filtration companies

• Laboratory technicians

• Hydroponic growers

• Aquaculture professionals

• Aquarium users

• Pool & spa technicians

• Environmental testing professionals

• Industrial water-treatment operators

• Research laboratories

• Scientific testing

• Wastewater professionals

• Water-quality consultants

Product Highlights

4 PARAMETERS IN ONE METER

pH + EC + TDS + Temperature

WIDE pH RANGE

0–14 pH

WIDE EC RANGE

0–9990 µS/cm | 0–9.99 mS/cm

HIGH TDS RANGE

Up to 8560 ppm

AUTOMATIC TEMPERATURE COMPENSATION

Advanced ATC with three temperature coefficients

DIGITAL CALIBRATION

Push-button calibration

REPLACEABLE SENSOR

SP-CP detachable pH/EC/TDS sensor

LARGE LCD

Simultaneous temperature display