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A pen-type TDS meter and digital pH meter is a compact and portable device that measures the concentration of total dissolved solids (TDS) and the pH level of a solution. It is commonly used in various applications, such as drinking water testing, aquariums, hydroponics, and scientific research.The TDS meter uses a small electric current to measure the concentration of dissolved solids in parts per million (ppm). It is equipped with a probe that is dipped into the solution to be tested. The meter measures the electrical conductivity of the solution, which is then converted into a TDS reading that is displayed on the digital screen.The digital pH meter measures the acidity or alkalinity of a solution on a scale of 0 to 14, with 0 being extremely acidic, 7 being neutral, and 14 being extremely alkaline. The device uses a glass electrode that is dipped into the solution being tested. The meter measures the hydrogen ions in the solution, which are then converted into a pH reading that is displayed on the digital screen.The pen-type TDS meter and digital pH meter is easy to use and requires minimal calibration. The device is portable, lightweight, and can be carried around easily. It is also very accurate and reliable, making it a valuable tool for anyone who needs to measure the TDS and pH levels of a solution on the go.The pen-type TDS meter and digital pH meter is commonly used by professionals such as scientists, researchers, hydroponic farmers, and aquarium owners. It is also useful for homeowners who want to test the quality of their drinking water or pool water.In conclusion, the pen-type TDS meter and digital pH meter is a valuable tool for anyone who needs to measure the TDS and pH levels of a solution accurately and efficiently. It is a reliable device that provides accurate readings and is very easy to use.