The Oakton Instruments WD-35661-94 is a CTS50 Waterproof Pocket Conductivity/TDS/Salinity Tester without a sensor. Automatic temperature compensation ensures accurate reading in varying environments. The redesigned leakproof cap with a fill line functions as a sample cup and stabilizing base to stand the meter upright.

• Easy-to-navigate interface for quick setup and calibration
• Self-diagnostic error messages, battery-life and stable reading indicators