This pen-style pocket tester delivers accurate and reliable measurements of conductivity, TDS, and salinity. It’s easy to use: simply press a button and dip the pen into the solution. The LCD gives you a quick measurement reading, alternating with temperature, available in both a live and hold measurement mode. Autoranging to select measurement range and single-point calibration features for KCl, NaCl and 442 natural water modes. Fully encapsulated electronics and a waterproof body constructed of anodized aircraft aluminum with protective coating provide excellent durability.