Quick and accurate readings – simply turn on the device, immerse it in about 1 inch of water, and read the measurement on the digital display for easy viewing. Features automatic calibration with no need for adjustment tools; calibration completes in 1–3 seconds. Measures total dissolved solids (TDS) in water to help determine when to replace water filters. Compact and handheld design with a carrying case for easy portability; fits conveniently in a pocket or bag. Ideal for home and laboratory TDS testing applications, including drinking water, swimming pools, aquariums, hydroponics, and more. Measurement range: 0–9990 ppm Accuracy: ±2% Powered by 2 x 1.5V LR44 button cell batteries (included) Dimensions: 5.51 x 0.79 x 0.6 inches (approximately 13.9 x 2.3 x 1.4 cm) Color: Navy blue Material: Plastic Package includes: 1 x TDS Meter Note: The package includes only the items listed above. Other items are not included. Note: Lighting and display differences may cause slight variations in color between the product image and the actual item. Measurement may vary by ±1–3 cm.