LaMotte 1749 Salt/TDS/Temperature TRACER PockeTester, 1.6" W x 7.4" L x 1.6" H Auto Power Off After 10 minutes of no button presses 0 to 199.9 S, 200 to 1999 S, 2.00 to 19.99 mS Conductivity Range 0 to 99.9 ppm and mg/L, 100 to 999 ppm and mg/L, 1.00 to 9.99 ppt and g/L TDS Range 0 to 99.9 ppm S, 100 to 999 ppm S, 1.00 to 9.99 ppt S Salinity Range