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Designed to test the water quality in 3 different parameters. It measures EC, CF and TDS without the need to purchase many different meters. Electrical conductivity (EC) and Conductivity Factor (CF) measures the ability of a material to conduct electric current while TDS is an expression of mobile charged ions (such as minerals, salts, metals, cations and anions) dissolved in a particular amount of water. The lower the EC, CF and TDS level in water, the higher its purity. Features 3 parameters: EC, CF, TDS with one electrode IP65 Waterproof design Replaceable electrode Large and clear LCD display Data Hold function Quick & highly accurate measurement Built-in Automatic Temperature Compensation (ATC) Factory pre-calibrated (mini-screwdriver is included for re-calibration if necessary) Specifications Measuring range: EC: 0.00 ~ 19.99 EC CF: 0.0 ~ 199 CF TDS: 10 ~ 19990 ppm Resolution: EC: 0.01 EC CF: 0.1 CF TDS: 10 ppm Accuracy: ±2% Full Scale (F.S.) Automatic Temperature Compensation:0 ~ 50°C (32 ~ 122°F) Operating Temperature: 0 ~ 50°C (32 ~ 122°F) Power supply: 4 x 1.5 V (AG13) Button Cell Batteries (Included and installed) Weight: approx. 98g (batteries included) Set Includes 1 x 3-in-1 Water Quality Meter 1 x Bottle EC 12.88 mS/cm Buffer Solution 1 x Bottle EC 1413 us/cm Buffer Solution 4 x 1.5 V (AG13) Button Cell Batteries 1 x English Instruction Manual 1 x Mini screwdriver Protective Carrying Case