pH/EC/TDS Combo Meter, Range: 0.00 – 14.00 pH, 0 – 4000 ppm, 0.00 – 6.00mS/cm, Accuracy ±0.20 pH and ± 2% Full Scale for EC & TDS, Comes with SE600 Combo Probe, 110 Volt Power Supply, Unit Mounting Kit, a 20ml Sachet of Calibration Solution of pH 7.01, 1500 ppm and 1413µS/cm