Measures conductivity (in a wide range of 0.1S ~ 199mS), salinity, TDS (total dissolved solids), and temperature. Determine water purity in boilers, coolers, water conditioning, waste water, photography, environmental testing, aquariums, labs, industrial and quality control. The large back-lit LCD shows conductivity, TDS (total dissolved solids) or salinity in large digits with time, date, and temperature (in C or F) shown simultaneously on the lower display. Scroll 99 data points directly on the LCD with time stamps, minimum, maximum and average readings. Also features hold, manual or auto range and ATC (automatic temperature compensation). Comes in a hard carrying case complete with built in RS-232 and IRDA ports, detachable probe with 3.5 foot cord, and 4 AAA batteries. Weight: 14oz (397g). Dim: 6.75 x 2.75 x 1.25 inches (170 x 70 x 33mm).