When the original DiST® ( Dissolved Solids Tester) was first introduced, conductivity and total dissolved solids measurements became easy and affordable. The DiST' s ease of use, in combination with its affordability made it the standard in EC and TDS measurement. HANNA continues the standard in EC and TDS testing with the DiST® 5. This tester includes features such as: a replaceable graphite electrode, adjustable TDS ratio, ° C or ° F measurement, Automatic Temperature Compensation ( ATC) with adjustable ² , battery level indicator, stability indicator, automatic shut-off and automatic calibration. The graphite conductivity electrode provides greater accuracy because it resists contamination by salt deposits in the sample. All of these features are packed in a floating, waterproof casing. This 3-in-1 tester is unmatched in EC/ TDS/ temperature measurements. Order Information: HI 98311 ( DiST 5) is supplied with HI 73311 EC/ TDS probe, HI 73128 probe removal tool, batteries and instructions.