Measures Total Dissolved Solids (TDS) to 19,990ppm (mg/L) plus pH and Conductivity. 0.5" (13mm) LCD built into adjustable "flip-up" cover. Front panel slope, calibration and temperature controls. Rugged design for handheld or benchtop use; neckstrap for "hands-free" operation. Automatic temperature compensation for Conductivity/TDS via thermistor built into conductivity cell