Small enough to fit in your pocket, the Oakton WD-35634-42 CTSTestr multiparameter tester is ideal for measuring conductivity, TDS, and salinity parameters as well as temperature. The large display provides easy viewing of measurements and features a two-color backlight - blue for measurement and green for calibration mode. A replaceable single-junction sensor saves you money by reusing the tester body.

Additional features of the WD-35634-42 include automatic temperature compensation (ATC), hold function to lock in measurements, self-diagnostic error message, and status icons for measurement stability and low battery voltage. The IP67-rated housing features an easy-to-grip design and floats if accidentally dropped in water when sensor cap is on. Powered by four AAA batteries, the tester can operate up to 400 hours continuously. To conserve power, the unit will auto power-off after 8 minutes of non-use.