ExStik II Conductivity/TDS/Salinity Meter. Autoranging meter offers 3 ranges of measurements from tap water to wastewater and any aqueous solution requiring a conductivity, TDS or Salinity measurements. Units of measure include uS/cm, mS/cm, ppm, ppt, mg/L, and g/L. High accuracy multi-range conductivity cell measures Conductivity, TDS, Salinity, and Temperature. Adjustable Conductivity to TDS ratio factor from 0.4 to 1.0 - conveniently calculates the TDS value. Large 3-1/2 digit (2000 count) Digital display with analog bargraph to indicate sample trends. Data Hold, Auto Power Off and low battery indication. Automatic Temperature Compensation of 2 percent per deg C. Simultaneous display of Conductivity, TDS, or Salinity plus Temperature. Internal memory stores up to 15 labeled readings for easy recall. Self calibration of electronics on power up. Easy to replace Conductivity cell module. Waterproof design to withstand wet environment - meets IP57 standard. EC400 includes meter and Conductivity cell, protective sensor cap, sample cup with cap, four SR44W button batteries, and 48 in. (1.2m) neck strap.