This compact unit measures pH from 0 to 14 with 0.01 pH resolution and accuracy. It offers one, two or three point calibration with a calibration alert for recalibration. Measures temperature from -5 to 90°C with automatic temperature compensation, and displays pH and temperature simultaneously. Store up to 15 readings in memory. Electrode modules are easily and inexpensively replaced. Meter flashes “RENEW” when electrode module needs to be replaced. Unit is waterproof and will float if dropped in water. Comes complete with meter, pH electrode module, protective sensor cap, batteries and neckstrap.