HM Digital COM-300 User Manual
COM-300
pH / EC / TDS / TEMP METER
Ver2.1E
OVERVIEW
CONTACT INFORMATION
SPECIFICATIONS
CONTENTS
Thank you for purchasing the Professional Series COM-300 Meter. The COM-300 is an advanced waterproof
combo meter with superior accuracy. The meter measures four parameters: pH, Electrical Conductivity (EC),
Total Dissolved Solids (TDS) and temperature. It can be used to test the acidity or alkalinity of almost any liquid,
provided the liquid contains less than 50% alcohol and a conductivity of at least 10 µS (5 ppm TDS (0.5 scale)).
The COM-300 features 2 different conductivity conversion factors to convert EC to TDS using the 0.5 (NaCl) or
0.7 (442TM) as well as selectable modes for measurements in the µS, mS and ppm scales. The meter incorporates
automatic temperature compensation (ATC) to accommodate for discrepancies in temperature that would naturally
occur. The meter also features digital calibration for easy and precise calibration that will yield better results.
If you have any problems or questions regarding your meter, please contact HM Digital, Inc
Info@HMDigital.com
HMDigital.com
1-800-383-2777
HM Digital, Inc.
Los Angeles, CA USA
pH Range: 0.0 – 14.0 pH
EC Range: 0 - 9990 µS; 0 - 9.99 mS
TDS Range: 0 - 8560 ppm (mg/L); 0.5 (NaCl) scale; 0.7 (442) scale, 0 - 5000 ppm (mg/L)
Temperature Range: 0.1 - 50°C; 32 - 122°F
Resolution:
pH: 0.1 pH
EC: 0 - 999: 1 µS; 1000 - 9990: 10 µS; 0-9.99 mS: 0.01 mS
TDS: 0 - 999: 1 ppm / 1000-9990: 10 ppm
Temperature: 0.1 °C/°F
Accuracy:
+/- 0.1 pH
+/- 2% EC/TDS
+/- 1 °C/°F
EC-to-TDS Conversion Factor: Pre-programmed, non-linear conversions for 0.5 (NaCl) or 0.7 (442™)
solutions, selected by the user
Temperature Compensation: Automatic (ATC) to 25°C (ATC range: 1-50°C)
Calibration:
pH: Push Button Auto-calibration to 4, 7 or 10 pH for a fine tune digital calibration.
EC/TDS: Digital calibration by push button (to any point within the range)
Auto Shut-Off: After 5 minutes
Probe: Detachable electrodes
Display: LCD panel
Housing: IP-67 Waterproof (Submersible, floats)
Power source: 2 x AAA batteries
Battery Life: Approximately 100 hours of usage (high ranges use greater power consumption)
Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)
Weight: 124g (4.4 oz) with batteries
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Overview
Contact Information
Specications
Housing and Screen Description
Taking Measurements
Switching Modes
EC / TDS Calibration
PH Calibration
Care, Maintenance & Techniques
Warranty
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1. Lanyard hook
2. Battery compartment
3. LCD display
4. Button panel
5. Power/Enter button
6. PH/EC mode, calibration mode, calibration-up button
7. EC/TDS mode, hold, calibration-down button
8. Sensor locking ring
9. Detachable sensor (Part # SP-C3)
Housing
SWITCHING BETWEEN pH AND EC/TDS MODES: To switch between the pH and EC/Conductivity modes
press the ‘PH/EC’ (middle button) on the meter.
BEFORE YOU START!
1. The meter's electrode is shipped with a wetted sponge of Potassium Chloride (KCI) storage solution.
If the sponge is dry (solutions can evaporate) use the included Mylar pack of storage solution
to saturate the probe before 1st use. Let it sit in solution for a minimum of 30 minutes.
2. For new meters, for your first few tests, lightly swirl the meter in the water or solution you
are testing 3 times and allow the meter to sit while adjusting to the reading.
3. If you need to test the pH of low conductivity/TDS water (below 50 µS/25 ppm), you should do so only
after using the meter a few times in a pH buffer solution or higher conductivity water.
4. Never touch the glass sensor or reference tube with your fingers. Be sure not to hit
the sensor or reference tube against a glass or beaker, to avoid cracking it.
5. Always make sure that the cap is on tight after usage.
1. EC mode (µS)
2. EC mode (mS)
3. TDS mode (ppm)
4. pH mode
5. pH / EC / TDS measurement
6. Calibration solution / conversion factor selected
7. Hold mode (appears when HOLD is pressed)
8. Temperature measurement
9. Celsius / Fahrenheit mode
10. Low battery indicator
11. Warning symbol
LCD Display
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