The AEC-5061 pocket electrical conductivity meter (EC meter) measures the electrical conductivity in a solution. It has multiple applications in research and engineering, with common usage in hydroponics, aquaculture, aquaponics, and freshwater systems to monitor the amount of nutrients, salts or impurities in the water. Measurement Range, 0 to 20 EC Automatic Temperature Compensation (ATC) 0 to +50C Impact resistant ABS case Splash-proof membrane key pad Retractable electrode, can be extended up to 80mm Manual calibration via screw trim pot Large LED display Pocket clip moulded on the rear of the instrument case Supplied with: Protective cap, calibration screwdriver, 50ml calibration solution, carry case and battery.