Auto-off and hold function - If there is no operation for 5 minutes, the PPM meter automatically shut down to save battery. With lock reading function, it is convenient for reading and recording. TDS Meter - Our TDS meter has functionality to test TDS, EC (Conductivity) and Temperature to meet your needs for 3 different measurements. Not only is it convenient , but it also saves you time and money, definitely a useful kit for your life. HIGH RANGE AND ACCURATE - Just stick the into the water and it can check readings between 0-9999 PPM, 0-9999μs/cm, 0.1 - 80.0°C, 32.0-176.0°F, and always has ±2% accuracy to correct readings. Simple operation - supports one-button operation, no calibration or settings required, just turn on the TDS meter and stir the water gently, then stable readings be displayed on the LCD within seconds. With carrying case, the compact and design makes this EC meter easy to carry. Wide Application - With an EC meter, you can check the TDS or EC of your drinking water, aquarium, swimming pool or any water source. You can determine the effectiveness of your RO, DI or distillation setup, check the nutrient levels of your hydroponic setup, and more., Manufacturer: CTRLZS