The Orion 131S is designed for measurement of conductivity, salinity, total dissolved solids and temperature. Wide measurement range allows for a variety of samples. The meter calibrates via AUTO-CALTM and cell constant adjustment method. The meter is compatible with two or four electrode cells. Temperature compensation options, such as automatic or manual linear function, and nonlinear function for ultrapure or natural water are available. This meter offers an easy to use interface cell status and self-diagnostic testing. The Orion 131S is intrinsically safe for use in a non-sparking environment. Complete field kit available. Field kit includes meter, probe or cell, beakers and standards. Meter warranty is three (3) years.