Description: The P773 is a wide-range, pocket-sized total dissolved solids (TDS) meter perfect for use in field environments. Having a rugged, waterproof housing, and replaceable electrodes, this meter will give long durable service. With 10 ppm resolution and ±2% FS accuracy, you will have high quality results at your fingertips. Automatic temperature compensation (ATC) adjusts for changes in TDS due to temperature.