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Features ➤ Lock function: Makes it easy to read and record, press HOLD button then remove from test solution. ➤4 Display modes: Press SHIFT button: TDS - ppm & °C, EC - µs/cm & °C, TDS - ppm & °F, EC - µs/cm & °F. 2 minute Auto Shut Off feature, so battery won't run down. ➤ Measurement Range: Conductivity: 0 - 9990 µs/cm TDS: 0 - 5000 ppm (parts per million) Degrees Celsius: 0.1 - 80.0°C, Fahrenheit: 32.0 - 176.0°F ➤Accuracy: ± 2% ➤ Net weight: 1.94oz (55g) ➤ Size: 6 x 1.2 x 0.6 inches (154 x 30 x 14 mm)