Effortlessly monitor the water quality of your hydroponic systems or aquariums with this Digital Water Quality Meter Test Pen. Designed to measure Total Dissolved Solids (TDS), Electrical Conductivity (EC), and temperature, this versatile tool is essential for maintaining the optimal environment for your plants or aquatic life. The TDS and EC readings provide crucial information on the concentration of dissolved salts and minerals, while the temperature measurement ensures that your system's conditions are within the desired range. Compact and easy to use, this meter pen is a practical addition to any gardener or aquarist's toolkit.