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Oakton EcoTester CTS Pocket Conductivity, Salinity, and TDS Meter Food & Water Storage A natural-organic liquid fertilizer formulatedOakton Conductivity, TDS and Salinity in one meter. Expanded 4 digit dual line display shows conductivity and temperature readings simultaneously. Additional key provides an easier, more intuitive interface. Improved cap functions as a sample cup and as a stabilizing base to stand the meter upright. Rugged IP67 rated housing is waterproof and floats. Battery level indicator flashes when battery is low. Batteries are included. Conductivity Accuracy: 2%