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EC-3M: Millisiemens Conductivity Tester with Case

Electrical Conductivity tester that reads in Millisiemens (mS)

Instruction Manual


  • Ideal for commercial use. Includes a carrying case with belt clip.
  • Highly efficient and accurate due to its advanced microprocessor technology.
  • Hold Function: saves measurements for convenient reading and recording.
  • Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries.
  • Measurement Range: 0.00-9.99 mS. From 9.99 mS, the resolution is in increments of 0.001 mS. From 1 to 9.99 mS, the resolution is in increments of 0.01 mS, indicated by a blinking 'x10' image.
  • Built-in digital thermometer
  • Display: large and easy-to-read LCD screen.
  • Factory Calibrated: The EC-3M has been factory calibrated to a 1.413 mS KCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Click here for a photo of the meter with its case.
  • Need help deciding which meter is right for you?  View our TDS/EC Meter Selection Guide.


EC Range: 0 - 9.99 mS (mS/cm)

Temp. Range: 0 - 80 degrees Celsius

Resolution: 0-9.99: 0.001 mS; 1-9.99: 0.01 mS (indicated by a 'x10' icon)

Temperature Resolution: 0.1 degree Celsius (Celsius only)

Accuracy: +/- 2%

ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50o C (33 to 122o F)

Power source: 2 x 1.5V button cell batteries (included)  (LR44 or equivalent)

Battery life: 1000 hours of usage

Dimensions: 15.5 x 3.1 x 2.3cm (6.1 x 1.25 x 1 inches)

Weight with case: 76.5g (2.7 oz)

Weight without case: 56.7g (2 oz)


To convert mS (milli-Siemens) to µS (milli-Siemens): multiply by 1000.

1 mS = 1000 µS

EC = Electrical Conductivity

>> Looking for a TDS meter?  If you are looking to measure TDS (in PPM), we recommend not            purchasing an EC meter.  Instead, we suggest one of these TDS meters: