Take the guesswork out of water quality with this compact and easy-to-use TDS Meter 2. Designed for quick and accurate measurement of total dissolved solids in water, this handy pen-style meter is perfect for testing drinking water, aquariums, hydroponics, pools, and more. Simply remove the protective cap, turn the meter on, and immerse it into the water up to the maximum immersion level (2 inches). The TDS meter automatically compensates for temperature variations, and the large LCD display stabilizes within 30 to 45 seconds, giving you a reliable reading at a glance. Use the convenient HOLD button to lock in your reading for easy reference. The slim, pen-shaped design makes it easy to carry and store, while the protective cap keeps the sensor safe when not in use. Whether you're a homeowner monitoring tap water quality or a hobbyist maintaining a healthy aquarium, this TDS meter delivers fast, dependable results every time. Batteries included. Please refer to the included instruction sheet for full usage guidelines.