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FEATURES: 1. Automatic Temperature Compensation(ATC) 2. Equipped with backlit LCD for easy reading 3. If TDS≤40, the backlit color is green 4. If TDS>40, the backlit color is red 5. Auto-Lock Function: From test beginning, the reading can be stabilized in seconds, and locked automatically for easy read and record 6. Hold Function: Before reading locked automatically, the reading can be locked manually if press "HOLD" 7. Factory Calibrated: No need calibration by user 8. Auto-Off in 2 Minutes to conserve battery 9. A colorful TDS chart on the back to explains ppm readings 10. Includes a protective carrying case with belt clip, easy to carry SPECIFICATIONS: 1. Measuring Range: TDS: 0 - 9990 ppm (parts per million) 2. Conductivity: 0 - 9990 µs/cm 3. Degrees Range: 32.0 - 122.0°F (0.1 - 50.0°C) 4. Accuracy: 2% F.S 5. Net Weight:1.62oz(46g) 6. Size:6.29 x 1.14 x 0.59 inches (160x29x15mm)