The GroCheck Combo Meter uses professional-grade sensors to test pH and TDS in one simple-to-use unit. The Combo Meter displays results clearly so users can check their readings quickly while the meter's durable water-proof casing ensures longevity. The meter ranges are: pH with range 0-14 and TDS with range 0-1990 ppm. pH readings have an accuracy of ±0.2 and TDS has an accuracy of ±2%. The calibration is manual for pH at 1 or 2 points and manual for TDS at 1 point. The adjustable setpoints for the meter are: 3.0 to 7.0 for pH and 500 to 1600 ppm for TDS. The GroCheck Combo Meter comes with replaceable probes, a 12VDC adapter with a 6.6' power cord, a grounding bar that helps probes last longer and gives more accurate pH readings, calibration solution, a calibration screwdriver and instructions. The meter carries a 2-year warranty and the probes each carry a six-month warranty.