Digital display water test pen with immediate readings. The device provides data and readings on a clear display. Quick and simple operation. Simply place the detection pen in the water to be tested, press the button, and the display shows the water values instantly to help you assess water purity. Durable construction and sensitive measurement. The shell is made of a plastic material and the probes use a metal alloy, delivering durability and sensitivity. Important usage note. The values test can be affected by water temperature, large water volumes, and pollution concentrations. Practical use scenarios Home use: test faucet or filtered drinking water to verify purity for everyday consumption. Outdoor field testing: check rivers, lakes, or other natural water sources during camping or hiking before use. Aquarium maintenance: monitor water quality in small tanks to support healthy aquatic life.