slbrillreTester with 4 Display ModesThis advanced water hardness test combines TDS (Total Dissolved Solids), EC (Electrical Conductivity) and a 3-in-1 digital temperature measurement test pen. This pH meter has 4 display modes to choose from, TDS - ppm and C, EC - s / cm and C, TDS - ppm and F, EC - s / cm and F (press the MODE button to convert). Luminous Alarm Function The lock function makes it easy to read and record, press the HOLD button, then remove it from the test solution. The pH tester has a luminous alarm function, green backlight with a TDS value below 40; red backlight when TDS value is over 40. Auto Power OffThe pH tester without operation 2 minutes automatic shutdown, so the battery will not run out, a convenient auto power off function ensures long battery life. Wide ApplicationThis digital TDS tester provides a detailed and accurate report on the quality of drinking water or used for your pets, fish and gardening. Automatic temperature compensation ensures accurate readings in both cold and hot water. Multiple Accessories1 * PH meter, 1 * Protective case, TDS, EC and Temperature Meter 3 in 1 EC: 0 to 9990 s/cm TDS: 0 to 9990 ppm (parts per million) Temperature range: 1-80 C; 33 to 176F Accuracy: +/- 2% Notes: To ensure the reading of this digital TDS tester pen is correct, it is better to buy pure water or distilled water to test, because both waters have a fixed value of -0, but the pool/SPA water does not have a fixed value. If 0 ppm is always displayed when testing, please don't worry. Please follow the steps below. Please check if the chip is exposed as the picture, if yes, follow step 2. Open the battery cover, then press the battery. Please check if the chip is reset as the pictures show. If the chip is in the right position, you can test it in water. Package Content: 1 x Water Test Meter 1 x Leather Protective Case Note: Do not drop the entire TDS meter into water or immerse beyond the maximum immersion level. This tester pen is not a waterproof design. out of the exhalation. Please rinse the probe with pure water after use, otherwise it will affect the accuracy of the next use (please avoid getting the pen body wet). Do not store the TDS meter at high temperatures or direct sunlight. This will shorten the shelf life of the product. Please avoid collision, weight or fall. If the reading is 0ppm, try pushing the battery for LG-STr Cela raccourcit la dure de conservation du produit. Veuillez viter les collisions, les poids ou les chutes. Si la lecture est de 0 ppm, essayez de pousser la batterie pouLG-STr