Waterproof ExStik II pH/Conductivity Meter. Measures 5 parameters including Conductivity, TDS, Salinity, pH, and Temperature using one electrode. 9 units of measure: pH, uS/cm, mS/cm, ppm, ppt, mg/L, g/L, deg C, deg F. Analog bargraph indicates trends. Memory stores up to 25 labeled readings. Adjustable Conductivity to TDS ratio from 0.4 to 1.0; 0.5 fixed Salinity ratio. RENEW feature alerts user when electrode needs replacement. Auto power off and low battery indicator. Waterproof to IP57. EC510 Kit includes EC500, 84uS/cm, 1413uS/cm, 12880uS/cm calibration standards, pH buffer pouches (1 each of 4, 7, 10pH plus rinse solution), weighted base, 3 sample cups with caps, and case.