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The pH-EC-TDS (PET) Meter combines three testers in one unit on a 3’ cable. This meter comes with a fast-response replaceable probe, 20 mL pH 7 buffer, 20 mL 1.41 EC and 1500 ppm calibration solutions, a 9V battery and instruction manual. The meter measurement ranges are: pH with a range 0.0 to 14.0 pH and resolution 0.1 pH, EC with a range 0.00 to 4.00 and resolution 0.01, and TDS with a range 0 to 1990 (ppm) and resolution 1 ppm. The accuracy is ±0.2 for pH; EC and TDS have an accuracy of ±2%. This meter features automatic temperature compensation and calibration knobs for 1-point manual calibration, so no screwdriver is required. A battery alert feature also lets customers know when the battery gets low, so they can always keep their meter working.