TDS Digital Water Quality Tester Meter Pen Type The TDS Digital Water Quality Tester Meter Pen Type is a pocket-sized, handheld device that measures the Total Dissolved Solids (TDS) in water. TDS is a measure of the amount of dissolved minerals, salts, and other substances in water. High levels of TDS can indicate that water is contaminated or unsafe to drink. The TDS Digital Water Quality Tester Meter Pen Type is an ideal tool for testing the quality of water in your home, office, or on the go. The TDS Digital Water Quality Tester Meter Pen Type is easy to use. Simply dip the probe into the water and press the "ON" button. The meter will display the TDS level in parts per million (ppm). The meter also has a "HOLD" button that allows you to freeze the reading on the display. The TDS Digital Water Quality Tester Meter Pen Type is a valuable tool for anyone who wants to ensure that their water is clean and safe to drink. It is also a great tool for educating children about water quality. Features: Measures TDS in ppm Easy to use Pocket-sized and portable Has a "HOLD" button to freeze the reading on the display Ideal for testing the quality of water in your home, office, or on the go Benefits: Helps you to ensure that your water is clean and safe to drink Educates children about water quality Helps you to make informed decisions about your water consumption