Accurate and Reliable: Equipped with an alloy electrode probe, this TDS meter ensures high precision in measuring water quality with a range of 0–9990 PPM. Ideal for both household and professional use. Easy to Read: Features a clear LCD display that shows measurements in PPM (parts per million), allowing for quick assessment of water purity levels. Portable Design: Compact and lightweight, this water quality testing pen is suitable for on-the-go testing in various environments such as homes, schools, aquariums, and pools. Versatile Use: Suitable for testing drinking water, aquariums, pools, spas, and hydroponic systems to help ensure water safety and quality. Color: Blue Material: Plastic and metal Package Contents: 3 x Water Quality Test Pens Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1–3 cm due to manual measurement.