Milwaukee's MW803 4-in-1 tester is advanced and accurate for reading pH, conductivity, TDS, and temperature. The meter incudes automatic calibration and temperature compensation for a variety of environments. All pH readings are displayed with a 0.01 pH resolution and accurate to ±0.05 pH. Conductivity is measured in the low range and readings displayed up to 3999 µS/cm. The EC reading can be converted to a TDS reading using either the default (0.5) or a user defined value. The large multi level LCD displays the battery level at start up and then either pH, EC, or TDS and temperature along with a stability indicator to alert the user when a stable reading is obtained. The pH/EC/TDS probe is replaceable.