Clean CON30 conductivity TDS salinity tester has broad measuring range 0.0 µS/cm -20.00mS/cm, from pure water to waste water applications, large LCD with backlight, 4 parameters in one meter - simple calibration, 1*1.5 AAA long battery life, self-Diagnostic for easy troubleshooting, auto lock function, floats on water, waterproof and dustproof housing - IP67 rated.