EC is measurements of the strength of the nutrient solution. Applications & Usage:It can be used in many applications such as in Aquarium, swimming pool, Spa, Nutrient, Hydroponics and laboratory and many more. Features: With Automatic Temperature Compensation Equipped with Electrode With CE Approval Wide range of applications in water quality testing Compact and light weight for mobility With accurate and clear display Easy push power button and calibration with the mini-screw driver Comes supplied with mini-screw driver and instruction manual to best utilize EC-1383 Specifications: Measuring range: 0~19.99ms/cm Resolution: 0.01ms/cm Accuracy: ±2%F.S Display: 4-digital LCD Automatic Temperature Compensation: 0-50°C Environment: Humidity: 95°C Power Supply: 2×3V(CR2032 Battery) Dimensions: 150mm×27mm×20mm Weight: 46g Calibration Solutions: mS/cm:12.88 ~ 13.0 mS/cm Probes: Electrodes Set Includes: 1 x EC Conductivity Meter 2 x CR-2032 (3V) Button Battery included 1 x Plastic Case 1 x Trimmer (screwdriver) 1 x English User Manual