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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