Features: Can lock- the readings for convenient reading and recording. Can be used to test TDS, EC and water temperature accurately. Compact- and lightweight, convenient to use and store in your pocket or bag, you can take- it anywhere. TDS: 0-9999ppm; Conductivity: 0-9999µs/cm-; Temperature: 0.1-80.0°C/ 32.0-176.0°F; Accuracy: ± 2%. Suitable for for testing water quality or purity- in water purifiers, water filter, drinking water, pools, spas, etc. Specifications: Material: ABS- Item size: approx 154x30x14mm/6x1.2x0.6-inch Package size: approx 158x35x25mm/6.2x1.4x1-inch Power supply: 2xCR2016 battery Color: yellow/blue Package Includes: 1xWater Quality Tester note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.