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COM-300 pH/EC/TDS/Temp/Salinity Meter

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Product Description

The COM-300 is a professional grade level pH/EC/TDS/Temp/Salinity meter ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, pools & spas, ecological testing, boiler & cooling tower management, and water treatment.


  • Measures Potential Hydrogen (pH), Electrical Conductivity (EC), Total Dissolved Solids (TDS), Salinity and Temperature
  • Five scales: pH, µS, mS, ppm 0.5 (NaCl) Scale & 0.7 (442™) Scale
  • Automatic Temperature Compensation (ATC) using three temperature coefficients
  • Waterproof housing (IP-67 rating)
  • Digital Calibration (push button) to any point within the meter’s range
  • Auto-off function, data-hold function and low-battery indicator
  • Display: large and easy-to-read LCD screen includes simultaneous temperature reading
  • Replaceable Sensor (model SP-CP)
  • Factory Calibrated (pH/EC/TDS)
  • Includes translucent cap, 2 (AAA) alkaline batteries, pH 4 & 7 calibration solutions, pH storage solution and lanyard


pH Range: 0 – 14 pH
EC Range: 0 – 9990 µS; 0 – 9.99 mS
TDS Range: 0 – 8560 ppm (0.7 Scale); 0 – 5000 ppm (0.5 Scale)
Temperature Range: 0-55 °C; 32-130°F
Resolution: 0-99: 0.1 µS/ppm/ 0.01mS ; 100-999: 1 µS/ppm; 1000-9990: 10 µS/ppm. Temp. resolution is 0.1 °C/F
Accuracy: +/- 2%
EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by the user.
Probe: Detachable platinum electrodes & pH glass sensor with reference tube electrodes
Housing: IP-67 Waterproof (submersible; floats)
Power source: 2 x Triple A (AAA) included
Dimensions: 7.3 x 1.3 x 1.3 inches
Weight: 3.6 oz

442 is a registered trademark of the Myron L Company

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