Digital display water test pen with a direct data reading function. It measures water quality by detecting three impurity categories and displays the results on the built in screen. Key features and benefits Quick on site water readings with a digital display Detects three impurity categories in water Measurement accuracy of ± 2% Simple one button operation: place the pen in the water, press the button, and the values are shown immediately Provides an immediate understanding of water purity to support safer decisions Important considerations Readings can be affected by water temperature Large bodies of water can influence results pollution concentrations can affect the displayed values How it works Submerge the detection pen in the water to be tested Press the button The display immediately shows the current water values Use scenarios Home and use: test drinking water or water from a home purifier or dispenser to verify safety and quality Food service and retail environments: quickly assess water quality for beverages in cafés, shops, or small restaurants Outdoor and travel use: evaluate water from outdoor sources such as streams or lakes during camping or trips to ensure it meets basic quality criteria Performance and practicality Immediate digital readout for fast decision making Simple operation requires no complex setup or training Suitable for general water quality screening in various settings without specialized equipment