General description The Water Quality Tester is an accurate EC meter, TDS meter, and temperature test pen designed for measuring the quality of drinking water, hydroponics, swimming pools, and aquariums. It features a backlit LCD for easy reading in various lighting conditions. Technical specifications TDS: 0 - 9990 ppm (parts per million) Conductivity: 0 - 9990 μs/cm Temperature range: 0.1 - 50.0°C (32.0 - 122.0°F) Accuracy: ±2% FS Weight: 70g Size: 16.2 * 2.9 * 1.5 cm / 6.4 * 1.1 * 0.6 in Operating environment: 0-50°C Power source: CR2032 button batteries Installation Take the pen cover off and turn on the ON switch. Usage Insert the pen into the test liquid, ensuring the liquid height does not exceed 4 cm. Shake the pen several times until the reading stabilizes. After use, dry the tip of the pen with a dry cloth and return it to the pen holder. Other information Factory calibrated, no need for further calibration. Avoid putting the whole pen into the liquid. Keep away from high