General description Multi-purpose water quality tester that combines a TDS meter, EC meter, and thermometer in one ergonomic pen. It is designed for accurate testing of drinking water, hydroponics, pools, and aquariums. Technical specifications TDS: 0 - 9990 ppm (parts per million) Conductivity: 0 - 9990 μs/cm Celsius: 0.1 - 50.0 °C Fahrenheit: 32.0 - 122.0 °F Accuracy: ±2% FS Operating environment: 0-50 °C Size: 16x3x2 cm Usage Remove the pen cover and turn on the ON switch. Submerge the pen into the test solution, ensuring the liquid does not exceed 4 cm in height. Shake the pen several times until the reading stabilizes. Dry the tip with a cloth and return the pen to its holder after use. Other information Features intelligent backlight design, automatic locking function, large screen reading, and automatic temperature compensation. Includes a 2-minute automatic shutdown feature to save battery life. Delicate exposed sensing element allows for accurate measurements in 5 seconds.