Product Description
Technical Specification
Instruction Manual
Data Sheet

Elcometer 138 Conductivity Meter

Incorporating a flat sensor, the Elcometer 138 Conductivity Meter can measure the conductivity of a solution from a single drop of a sample.

Users can either place a sample on the conductivity meter’s flat sensor or immerse the meter’s sensor directly into the solution under test. The Elcometer 138 Conductivity Meter can be used for a broad range of applications, including: soluble salt concentrations, the electric conductivity (EC) of solutions used in agricultural operations and measuring rainwater pollution levels.

The Elcometer 138 Conductivity Meter features:

  • Highly precise measurements can be obtained from a single drop
  • Automatic range switching gives a wide measurement range of 1μs/cm to 19.99mS/cm
  • Out of range and low battery alarms
  • Visual indication when ambient temperature is outside the operating range
Elcometer 138 Conductivity Meter
Elcometer 138 Conductivity Meter

Technical Specification

Part Number Description
E138-CM  Elcometer 138 Conductivity Meter

Measurement Principle

2 Electrode Bipolar AC

Measurement Mode

Conductivity, Temperature

Minimum Sample Volume


Measurement Range

0 - 19.99mS/cm


0 - 1999μS/cm: 1μS/cm
2.00 - 19.99mS/cm: 0.01mS/cm


±2% full scale (for each range)

Operating Temperature

5°C to 40°C (41°F to 104°F)

Operating Humidity

85% or less relative humidity (no condensation)

Battery Type

2 x CR2032 lithium batteries

Battery Life

approx. 200 hours of continuous use without backlight


50g (1.76oz) - including sensor and batteries


164 x 29 x 20mm (6.5 x 1.1 x 0.79”)

Packing List

Elcometer 138 Conductivity Meter, 14ml (0.5fl oz) bottle of conditioning solution, 14ml (0.5fl oz) bottle of standard 1413μS/cm calibration solution, 2 x CR2032 lithium batteries and operating instructions



Replacement Sensor


Standard 1413μS/cm Calibration Solution, 250ml (8.45fl oz) Bottle



How to measure soluble salts on surfaces using the Elcometer Bresle Test Patch

Discover the benefits of the new Elcometer 135C Bresle Test Patch. With 19% thicker foam walls, high quality adhesive and easy to peel off the substrate leaving no foam residue, the new Elcometer 135C Bresle Test Patch is ideal for measuring soluble salts in the field.


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