The Elcometer 138 Conductivity Meter (E138-CM) measures the conductivity of a solution from a single drop of sample. Conductivity is a direct indicator of dissolved salt concentration, so the meter supports decisions on surface cleanliness and water quality, where excess soluble salts drive premature corrosion and coating failure. A sample can either be placed on the meter's flat sensor or the sensor can be immersed directly into the solution under test.

The Elcometer 138 Conductivity Meter uses a 2 electrode bipolar AC measurement principle and needs a minimum sample volume of 0.12ml. Automatic range switching gives a wide measurement range from 0 to 19.99mS/cm, with a resolution of 1μS/cm up to 1999μS/cm and 0.01mS/cm from 2.00 to 19.99mS/cm, at an accuracy of ±2% of full scale. It also reports temperature. Out of range and low battery alarms are provided, along with a visual indication when ambient temperature is outside the operating range of 5°C to 40°C.

Powered by two CR2032 lithium batteries for approximately 200 hours of continuous use without backlight, the Elcometer 138 Conductivity Meter weighs 50g including sensor and batteries and measures 164 x 29 x 20mm. It can be used in accordance with ISO 8502-6, ISO 8502-9, US Navy PPI 63101-000 (Rev 27), ISO 8502-11, AS3894.6A and SSPC Guide 15. Applications include soluble salt concentration, the electric conductivity of agricultural solutions and rainwater pollution levels. Supplied by BAMR, South Africa's authorised distributor.